Tag Archives: change

Climate change could impact cicada cycles, scientists warn

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The cicadas that synchronize their emergence with others have a better chance of survival. Scientists believe that the simultaneous emergence of insects is an evolutionary strategy. Predators like birds and raccoons can only consume a limited amount, so the more cicadas emerge together, the higher their chances of survival, reproduction, and passing on their genes. “They have a strategy of safety in numbers,” explains Chris Simon, a professor of ecology and evolutionary biology at the University of Connecticut.

On the other hand, rare cicadas that emerge out of sync are often referred to as “strays.” These stragglers are usually preyed upon and struggle to survive. “Natural selection favored those that waited, because those that couldn’t wait were eaten,” Simon said.

This summer, two cicada broods are expected to emerge simultaneously, leading to a particularly large population of periodic cicadas. The last time such an event occurred was in 1803. The organization behind the Cicada Safari app, which aims to track cicada sightings and help scientists study these insects, has already recorded over 1,000 sightings in Georgia and hundreds more in North Carolina and Alabama.

Periodic cicadas are categorized into two groups based on their emergence period: those that appear every 13 years and those that appear every 17 years. While temperature seems to trigger their emergence, the exact mechanism behind how they synchronize their emergence remains somewhat mysterious. Scientists have observed changes in cicadas’ emergence patterns, speculating that rising temperatures due to climate change may be impacting their internal clocks.

Entomologist Gene Kritsky notes that global warming is causing cicadas to emerge earlier in the year due to higher average temperatures. This shift in emergence time has been observed to be approximately 10 days to two weeks earlier than in 1940. Researchers like John Cooley predict that cicadas’ distribution will shift northward as the climate warms and their preferred plant species move north.

There has been an increase in reports of stragglers, intriguing researchers in the field. Simon and her colleagues believe that climate change may be influencing the emergence of cicadas earlier than usual, leading to the formation of new populations among stragglers. This adaptation is seen as a response to a warming climate and extended growing seasons.

Simon proposes a theory that rising temperatures may prolong the development of cicadas underground, resulting in the emergence of more stragglers sooner than expected. Eventually, the population as a whole may adapt and change its timing. She predicts that the 17-year cicada broods may transition to a 13-year cycle and possibly even emerge every nine years.

If proven correct, this theory would be another example of how climate change is disrupting natural rhythms in the environment. Periodic cicadas, harmless to humans, range across the eastern United States to the Midwest and emerge in special events rather than yearly like annual cicadas.

While scientists continue to study how cicadas coordinate their mass emergence, they have yet to discover a precise explanation for their successful synchronization. A recent study suggests that underground communication could be a potential factor worth investigating further. “No one has ever studied this,” Simon said.

Source: www.nbcnews.com

The Gullah-Geechee community faces a threat from climate change.

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The National Oceanic and Atmospheric Administration (NOAA) is providing millions of dollars to help traditionally underserved coastal communities combat climate change. This funding includes a significant stretch of 12,000 square miles of land spanning from North Carolina to Florida, known as the Gullah-Geechee Cultural Heritage Corridor. Designated by Congress in 2006, this land increases the wealth of the Gullah-Geechee by allowing communities along the corridor to utilize federal funds for programs and projects and receive technical and financial assistance from the National Park Service, all in an effort to protect and preserve their history and culture.

In April 2023, NOAA also announced over $265 million in funding for 38 new projects aimed at strengthening the climate resilience of coastal ecosystems and communities. These projects include initiatives in South Carolina to accelerate living shoreline projects in underserved communities, as well as collaborations with the Gullah-Geechee Cultural Heritage Corridor to create living shoreline projects in these communities. Additionally, the funding includes $6.2 million for programs supporting the Regional Ambassador Program for Coastlines.

NOAA-recommended projects involve hiring new staff to assist restoration organizations in building relationships with the Gullah-Geechee community, identifying resiliency priorities for community members, and establishing local relationships to support future restoration efforts. Moreover, $536,000 has been allocated to form an advisory committee.

A Gullah woman weaves a sweetgrass basket, circa 1930.
H. Armstrong Roberts/Classic Stock/Getty Images

Tia Clark operates Casual Club with Tia in Charleston, South Carolina, focusing on catching blue crabs, a staple in Gullah-Geechee cuisine. She participates in a conservation effort to build oyster reefs and create habitat for marine life to thrive, as rising temperatures are endangering crab habitats. With blue crab populations at an all-time low in South Carolina in 2023, Clark emphasizes the need to protect these resources from further decline.

Clark collaborates with state agencies and local schools to educate students about the importance of preserving water resources for future generations, emphasizing the impacts of climate change on the environment and wildlife.

Numerous federal programs support the Gullah-Geechee Cultural Heritage Corridor, emphasizing the importance of combatting climate change to protect the land, water, and way of life cherished by those living along the corridor.

“We are dedicated to ensuring the survival and continuation of our traditions as native Gullah Geechee,” said Queen Couette. “We are committed to preserving our heritage for generations to come.”

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Source: www.nbcnews.com

Traditional pessimism could be a valuable tool in combating climate change

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Pessimism is a dirty word in climate policy circles. There are good reasons for this. Especially because while optimism can encourage positive change, assuming the worst can paralyze us and prevent us from taking action. But when it comes to climate modeling, a certain amount of negativity can be a good thing.

The Intergovernmental Panel on Climate Change is already working on various models and pathways to assess how to limit warming to 1.5°C and how to ensure that carbon emissions continue unabated or experience many possibilities in between. I use it to hedge my bets. These pathways are backed by thousands of scientific papers, tons of data, and the brains of the world’s climate scientists, but like all models, they are built on assumptions.

One of the key assumptions in the scenario of keeping temperature rise below 1.5°C is that the technology to remove carbon dioxide from the atmosphere will be rapidly perfected in the near future. This is not an unreasonable prediction, given human ingenuity and strong incentives to do so. But incorporating carbon capture technology into these models is like declaring that winning the lottery will balance the household budget. If you can’t reduce your spending to an affordable level, you better hope that a big prize is on the way.

As the two articles in this issue demonstrate, this is a dangerous approach. A detailed analysis of geological carbon storage plans shows that it is at least very unlikely, if not impossible, to meet the levels envisioned for many 1.5°C pathways. (“Our plans to tackle climate change with carbon storage add up”). The chances of winning the lottery don’t seem that high. On the other hand, we also received an unexpected carbon bill in the form of melting Arctic permafrost, releasing more greenhouse gases than previously accounted for. Frozen soil is now a major net source of greenhouse gases (see “Frozen soil is now a major net source of greenhouse gases”).

While these revisions in our understanding of climate change are entirely expected and to be welcomed, they do signal that the challenges we face over the next decade will only get more difficult. . Rather than narrowing down climate models until the numbers roughly match the 1.5°C goal, perhaps it would be better to take a more pessimistic outlook and accelerate efforts to limit the damage.

topic:

  • climate change/
  • global warming

Source: www.newscientist.com

Climate change cannot be averted by new technologies – here’s what will occur

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When I was young, I had a fascination with science fiction TV shows like Star Trek and Doctor Who. These captivating stories thrilled my inner geek.

The typical plot of these shows involved a crisis that seemed insurmountable, only to be miraculously solved by the hero at the last moment. Whether it was Scotty’s engineering wizardry on the USS Enterprise or the Doctor’s clever use of a sonic screwdriver, one thing was certain: technology would save the day.

As a child, I adored these narratives, and a part of me still holds onto that love. I wish that some futuristic technology could swoop in and rescue us from the global crisis of climate change. Unfortunately, reality tells a different story.

One fundamental reason why high-tech solutions won’t be our savior in the face of climate change is the issue of time. Time is a crucial factor that technology cannot simply create more of. Climate change is a cumulative problem that has been fueled by years of greenhouse gas emissions accumulating in our atmosphere.

Over the years, billions of tons of greenhouse gases have been released into the atmosphere, fundamentally altering our climate system. To combat the devastating effects of climate change, we need to focus on reducing emissions immediately and consistently to mitigate future impacts.

Today, we already have solutions to address climate change, including increasing efficiency, reducing waste, electrifying homes and vehicles, and transitioning to renewable energy sources. These quick-acting solutions can help buy us time to implement long-term strategies to combat climate change effectively.

Waiting for a new, perfect solution to emerge is not an option. We must act now with the tools we have at our disposal. Fusion energy, advanced nuclear power, and industrial carbon capture technologies may hold promise for the future, but we cannot afford to wait for them to save us from the imminent crisis of climate change.

Credit: Justin Padgett

In the battle against climate change, time is of the essence. We must focus on implementing existing solutions rather than waiting for a hypothetical technological breakthrough. Science-fiction dreams of miraculous solutions won’t save us now. It’s time to act with the tools we have today.

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Source: www.sciencefocus.com

The impact of climate change on food costs: A prediction of rising prices and worsening conditions

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Food prices are on the rise

AFP (via Getty Images)

Because of global warming, you are already paying more and more for groceries. And rising temperatures will cause food prices to rise significantly over the next decade.

By 2035, rising temperatures alone are expected to increase global food prices by 0.9 to 3.2 percent each year, according to a study conducted in collaboration with the European Central Bank. This would increase the overall inflation rate by 0.3 to 1.2 percentage points.

“We are often shocked and surprised by the magnitude of these effects,” he says. Maximilian Kotz He mentioned discussions he had with economists during his research at Germany's Potsdam Institute for Climate Impact Research.

Abnormal weather due to global warming Increasingly impacting food production around the world And if farmers don't adapt, the losses will become even more severe as the world continues to warm.

To find out how this is affecting food prices, Kotz and his colleagues looked at monthly price data for a variety of goods and services for 121 countries from 1996 to 2021 and the exposure to which those countries were exposed. The weather conditions were compared.

Researchers looked at the correlation between food prices and factors such as average monthly temperatures, temperature fluctuations, droughts and extreme rainfall. They found a strong association between average temperature and food prices a month or so later.

Areas north of 40 degrees latitude, such as New York City, Madrid, and Beijing, experienced warmer-than-average winter temperatures, leading to lower food prices. But not just in the summer, temperatures in other parts of the world have always been above average, causing food prices to rise.

Moreover, the impact on prices is long-lasting. “If prices go up based on one of these shocks, they stay high for at least the rest of the period,” Kotz says.

The study didn't look at why prices have increased, but one possible explanation is that extreme heat is reducing yields, he said. “The vines may be dry when the crop should be harvested.”

Kotz said factors such as extreme rainfall had a smaller impact on food prices than average temperatures. This may be because flooding tends to be localized, whereas above-average temperatures can be very widespread.

Other studies have reached similar conclusions, Kotz said. But his team went a step further and investigated how food prices would change based on increases in average temperatures in climate model projections. Under the team's worst-case emissions scenario, global food inflation due to climate change will exceed 4% per year by 2060. However, the team believes the 2035 prediction is more reliable, as many other factors could have changed by then.

“There are a lot of things that could happen that will change the way the economy responds to climate change,” Kotz said. For example, inflationary pressures would be reduced if farmers adapted their practices to better cope with rising temperatures. But so far, he says, there is no sign that farmers are adapting.

“I think these are realistic predictions. They are based on solid empirical evidence.” Matin Kaim At the University of Bonn, Germany. “We need to recognize the fact that climate change poses new and major challenges to food and nutrition security.”

according to Food Price Index of the Food and Agriculture Organization of the United Nations, The cost of food fell in real terms between 1960 and 2000, but has risen since then. Russia’s invasion of Ukraine in 2022 caused a massive surge – factors that influence this Protests are occurring in many countries. The index price has since fallen, but remains higher than before the invasion.

Like the US Federal Reserve and the Bank of England, the European Central Bank aims to: keep inflation around 2%. Rising food inflation will make achieving this goal even more difficult, Kotz said.

topic:

Source: www.newscientist.com

Why recycling may not always be the most effective solution for combating climate change

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Recycling is not a silver bullet to stop climate destruction. Far from it. Potential Impact – Savings of approximately 11 gigatons of carbon dioxide (CO2) over 30 years. Even if the world recycled more than 80 percent of its municipal waste, that amount would be overshadowed by the greenhouse gases emitted by fossil fuels and industry – a staggering 36.8 gigatons in 2022 alone.

In the UK, it is estimated that recycling 18 million tons of CO2 annually. This is equivalent to removing five million cars from the road. While promising, it is only a very small fraction of the emissions generated by fossil fuels and industry each year, which are about 200 times greater than those from agriculture and the global fashion industry.

These numbers may be discouraging, but what can an individual do to help?

Reduce, Reuse, Recycle

First and foremost, do not give up on recycling. It is a simple way to reduce landfill waste and slow down the depletion of the earth’s resources.

To put into perspective the impact of recycling, dividing the 18 million tonnes by the UK’s population of 67 million, the average Briton is saving about 269kg of CO2 per year through recycling.

According to DEFRA, Britons recycled 44% of household waste in 2021. By recycling 100% of household waste, an individual could save up to 610kg per year.

If you truly want to make a difference, focus on making sustainable choices early on in the consumption process. Opt for loose fruits and vegetables, solid detergents, repair and reuse old clothes, and most importantly, buy less.

Emphasize the Reduce and Reuse aspects of the 3R mantra and resort to recycling only when other options are exhausted.

Let’s Start With One Thing

If you feel overwhelmed, start by making one sustainable change at a time. For example, by using a reusable water bottle instead of plastic ones, you can save 20kg of CO2 per year.

A review of thousands of studies worldwide suggests that changes like taking fewer long-haul flights, using public transport, and improving home energy efficiency are significant in reducing household carbon footprints.

While recycling alone may not be the solution to climate change, it is a step in the right direction. Each individual has the power to make a positive impact.

This article addresses the question posed by Jensen Pitts via email: “Can recycling really make a difference?”

If you have any questions, please email us at: questions@sciencefocus.com or reach out to us via Facebook, Twitter, or Instagram (don’t forget to include your name and location).

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Source: www.sciencefocus.com

Satoshi Nakamoto, the founder of Bitcoin, refutes claims of early climate change worries

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Bitcoin was created by Satoshi Nakamoto

Damian Ravaso/Alamy

Bitcoin’s mysterious founder Satoshi Nakamoto dismissed early concerns about the cryptocurrency’s potential to consume large amounts of electricity and contribute to carbon emissions, according to newly released emails.

The true identity of Bitcoin’s creator was never revealed, but after Bitcoin’s creation in January 2009, Nakamoto (a pseudonym) remained active in online forums and emails until late 2010, after which he was removed from the project and stopped communicating with him. .

…

Source: www.newscientist.com

YouTube challenges climate change denialism

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Climate change denial has taken on a new focus, according to a recent report from the Center for Digital Action. Instead of denying that the planet is warming, scientists and activists are now questioning climate change solutions and skepticism about policy. Hate, a nonprofit organization researching digital hate speech and misinformation, has outlined this shift in their analysis. They argue that YouTube’s parent company, Google, has ineffective content policy regulations aimed at blocking ad revenue from content denying the scientific consensus of climate change.

Imran Ahmed, CEO of the organization, stated, “A new front has opened in this battle. They used to say climate change wasn’t happening, and now they’re saying, ‘Climate change is happening, but there’s no hope. There are no solutions.'” This reflects the evolution of the debate from outright denial to skepticism about the severity of climate change and potential solutions.

For decades, scientists have agreed that human activities, particularly the burning of fossil fuels, are causing an imbalance in the atmosphere, leading to global warming. As the Earth warms, the impacts are becoming increasingly evident, such as melting ice shelves and rising sea levels. Public perception of climate change has changed over recent decades, although it remains highly politicized, according to Pew Research Center.

The Center for Countering Digital Hate utilized artificial intelligence models to analyze YouTube videos with climate change denial content. Their analysis revealed a shift in the denial narrative from denying the existence of global warming to attacking climate change solutions.

John Cook, a senior research fellow, sees similar trends in his work, stating that the focus has shifted from questioning the existence of climate change to evaluating the seriousness of the problem and the effectiveness of proposed solutions.

The report also highlighted YouTube’s policies regarding misinformation about climate change and their failure to stop the monetization of negative narratives. They suggest that YouTube and Google should expand the types of content they can’t monetize to include climate change denial and to update their policies based on current trends.

YouTube has responded, stating that they prohibit advertising on content that violates the scientific consensus on climate change. They allow discussion and debate on the topic but will not show ads on videos that cross the line of climate change denial.

Source: www.nbcnews.com

The Extinction of the World’s Largest Ape: A Result of Climate Change

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HONG KONG — Didn't fall from the Empire State Building.

Instead, the giant ape, sometimes called the “real King Kong,” was driven to extinction by climate change that made its favorite fruit unavailable during the dry season, according to a new study published Wednesday in the journal Nature. The results have been announced.

An artist's impression of a herd of giant apes Gigantopithecus blackii in a forest landscape in southern China.Southern Cross University/AFP – Getty Images

They can grow up to 10 feet tall and weigh up to 650 pounds. Gigantopithecus brachy Hundreds of thousands of years ago, they roamed the forested plains of southern China's Guangxi Zhuang Autonomous Region, feeding on fruits and flowers.

But researchers have discovered that the apes' harsh diet may have led to the species' extinction.

The herbivorous apes made the “fatal mistake of becoming reluctant to change their food preferences to find new, more nutritious foods,” the study's lead researcher Yin-chi Chan said Thursday. told NBC News.

“As the environment changed, the food this great ape preferred became unavailable. But this great ape did not adapt to its dietary preferences. It remained dependent on a diet with low nutritional value. ” he added.

Zhang, a Beijing-based paleontologist, said the creatures stuck to dense forests, while apes like orangutans quickly adapted and moved into open forests, eating small animals.

Gigantopithecus blackii, thought to be the largest primate on Earth, roamed the plains of southern China before going extinct. Southern Cross University/AFP – Getty Images

The reason for the species' extinction has been a mystery ever since a tooth was discovered in a Hong Kong pharmacy in 1935 by German-Dutch paleontologist Gustav Heinrich Ralph von Königswald. It was sold as “Dragon Tooth”.

This discovery led to extensive research for more fossils, but 85 years later, only 2,000 isolated teeth and parts of the lower jaw have been discovered. No parts other than the skull were recovered.

Without a “precise timeline” of extinctions, “we're looking for clues in the wrong places,” said Kira Westaway, one of the study's lead authors and a geochronologist at Macquarie University in Sydney. says.

However, the researchers were able to use one of the latest techniques, called “luminescence dating,” which allowed them to determine the age of the soil around the fossils in 22 caves in southern China.

From this, they concluded that the great apes went extinct between 295,000 and 215,000 years ago.

“Now we have a target zone. We have a target period. So we start looking at changes in the environment,” Westaway said.

The researchers also found clues in the fauna around the cave, with analysis of pollen and wear on the great apes' teeth showing that changing seasons led to a lack of fruit and reduced reliance on less nutritious food. It became clear that he was no longer able to earn money.

“Gigants couldn't really expand their foraging range to find more suitable food because they're so big. Orangutans are also very small, mobile, and very “It's agile,” Westaway said, adding that the new study provided a blueprint for further research into the main extinction event.

“You need to get a very precise timeline. You need to look at what the environment is doing and then look at how they acted,” she said.

From about 2 million to 22 million years ago, dozens of species of great apes lived in Africa, Europe, and Asia. Today, only gorillas, chimpanzees, bonobos, and orangutans remain.

Westaway said the research could also open the door to future possibilities for how humans can adapt to adverse weather events and ensure species survival.

“This sets a precedent for trying to understand how primates respond to environmental stress and what makes certain primates vulnerable and what makes others resilient.” she says.

Mitchell Agarwal

Mithil Aggarwal is a reporter and producer for NBC News based in Hong Kong.

alice kong

Alice Kong is an intern on NBC News' Asia desk.

Associated Press contributed.

Source: www.nbcnews.com

The Relationship Between Seismology and Climate Change Noise

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Since the 1980s, seismic observatories have detected increases in the strength of ocean waves that correlate with climate change. A Colorado State University study analyzed more than 35 years of data and found that ocean waves are becoming significantly stronger, reflecting the increased intensity of storms due to global warming. This seismic data reveals long-term trends and changes in wave energy and highlights the need for resilient strategies to protect coastal regions from the effects of climate change.

Since the late 1980s, modern digital seismic observatories have been monitoring Earth’s vibrations around the world. Previously thought by seismologists to be just a background disturbance, the persistent low hum produced by ocean waves has become stronger since the late 20th century, according to a study led by Colorado State University.

This research nature communicationsexamines data from 52 seismic stations that recorded the Earth’s movement once a second over 35 years. This decades-long record supports independent climate and ocean research that suggests storms are becoming more intense as the climate warms.

“Seismology can provide stable, quantitative measurements of what is happening to waves in the world’s oceans, complementing research using satellites, oceanography, and other methods.” said author Rick Astor, professor of geophysics and chair of Earth Sciences at CSU. “The seismic signal is consistent with these other studies and shows the types of features expected from anthropogenic climate change.”

Astor and his collaborators at the U.S. Geological Survey and Harvard University studied first-order microseisms, the seismic signals produced by large, long-period waves that cross shallow regions of the world’s oceans. The ocean floor in coastal areas is constantly being pushed and pulled by these waves, and these pressure changes generate seismic waves that are picked up by seismometers.

Seismic station locations and global trends since the late 1980s: (a) Ground vertical acceleration amplitude in billionths of a meter, (b) Acceleration amplitude normalized to the historical median, and ( c) Normalized by the historical median of seismic energy.Credit: Rick Astor

Seismometers are best known for monitoring and studying earthquakes, but they also detect many other things, including the movement of glaciers, landslides, volcanic eruptions, large meteorites, and noise from cities. Seismic waves from various forces on or within the Earth’s surface can be seen at great distances, sometimes even on the other side of the Earth.

“As the atmosphere and ocean warm, storms become more intense because they contain more energy, and the ocean waves they cause increase in size and energy,” Aster said. “Increasing the energy of ocean waves directly increases the strength of seismic waves.”

make (bigger) waves

Seismic signals show that the Southern Ocean waves of the infamous storm around Antarctica are predictably the most intense on Earth, while the waves in the North Atlantic are the most rapidly intensifying in recent decades, with waves in eastern North America and western Europe It reflects the storm that rages between.

In addition to the steady rise in wave energy that reflects widespread increases in global ocean and air temperatures, the data also show multi-year climate patterns such as El Niño and La Niña that influence the strength and distribution of global storms. Masu. And an even bigger storm.

“It’s clear that these long-term earthquake records show general signs of storm activity around the world, in addition to long-term intensification due to global warming,” Astor said. “It looks like a small signal from year to year, but it’s gradual and becomes very clear when you work with more than 30 years of data.”

Astor and his colleagues found that global average ocean wave energy has increased by a median of 0.27% per year since the late 20th century, and by 0.35% per year since January 2000.

Stormy weather forecast

Mr Astor said storm surges associated with larger waves and larger storms, coupled with rising sea levels, were a serious global problem for coastal ecosystems, cities and infrastructure.

“In addition to efforts to mitigate climate change itself, we will need to implement resilient strategies to ensure coastal populations and ecosystems are protected from an increasingly stormy future.” said Astor.

Reference: “Increase in ocean wave energy observed in Earth’s seismic wave field since the late 20th century” by Richard C. Astor, Adam T. Ringler, Robert E. Anthony, and Thomas A. Lee, October 32, 2023 , nature communications.
DOI: 10.1038/s41467-023-42673-w

This research was funded by the U.S. Geological Survey and the National Science Foundation.

Source: scitechdaily.com

Scientists are using flawed strategies to predict species responses to climate change, posing a dangerous risk of misinformation.

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A new study reveals that a spatiotemporal substitution method used to predict species responses to climate change inaccurately predicts the effects of warming on ponderosa pines. This finding suggests that this method may be unreliable in predicting species’ future responses to changes in climate. Credit: SciTechDaily.com

A new study involving researchers at the University of Arizona suggests that changes are happening faster than trees can adapt. The discovery is a “warning to ecologists” studying climate change.

As the world warms and the climate changes, life will migrate, adapt, or become extinct. For decades, scientists have introduced certain methods to predict how things will happen. seed We will survive this era of great change. But new research suggests that method may be misleading or producing false results.

Flaws in prediction methods revealed

Researchers at the University of Arizona and team members from the U.S. Forest Service and Brown University found that this method (commonly referred to as spatiotemporal replacement) shows how a tree called the ponderosa pine, which is widespread in the western United States, grows. I discovered something that I couldn’t predict accurately. We have actually responded to global warming over the past few decades. This also means that other studies that rely on displacement in space and time may not accurately reflect how species will respond to climate change in coming decades.

The research team collected and measured growth rings of ponderosa pine trees from across the western United States, dating back to 1900, to determine how trees actually grow and how models predict how trees will respond to warming. We compared.

A view of ponderosa and Jeffrey pine forests from Verdi Mountain near Truckee, California.Credit: Daniel Perrette

“We found that substituting time for space produces incorrect predictions in terms of whether the response to warming will be positive or negative,” said study co-author Margaret Evans, an associate professor at the University of Arizona. ” he said. Tree ring laboratory. “With this method, ponderosa pines are supposed to benefit from warming, but they actually suffer from warming. This is dangerously misleading.”

Their research results were published on December 18th. Proceedings of the National Academy of Sciences. Daniel Perrette, a U.S. Forest Service ORISE fellow, is the lead author and received training in tree-ring analysis through the university’s summer field methods course at the University of Arizona Research Institute. The study was part of his doctoral dissertation at Brown University, and was conducted with Dov Sachs, professor of biogeography and biodiversity and co-author of the paper.

Inaccuracies in space and time substitutions

This is how space and time permutation works. All species occupy a range of favorable climatic conditions. Scientists believe that individuals growing at the hottest end of their range could serve as an example of what will happen to populations in cooler locations in a warmer future.

The research team found that ponderosa pine trees grow at a faster rate in warmer locations. Therefore, under the spatial and temporal displacement paradigm, this suggests that the situation should improve as the climate warms at the cold end of the distribution.

“But the tree-ring data doesn’t show that,” Evans said.

However, when the researchers used tree rings to assess how individual trees responded to changes in temperature, they found that ponderosa was consistently negatively affected by temperature fluctuations.

“If it’s a warmer-than-average year, they’re going to have smaller-than-average growth rings, so warming is actually bad for them, and that’s true everywhere,” she says.

The researchers believe this may be happening because trees are unable to adapt quickly enough to a rapidly changing climate.

An individual tree and all its growth rings are a record of that particular tree’s genetics exposed to different climatic conditions from one year to the next, Evans said. But how a species responds as a whole is the result of a slow pace of evolutionary adaptation to the average conditions in a particular location that are different from those elsewhere. Similar to evolution, the movement of trees that are better adapted to changing temperatures could save species, but climate change is happening too quickly, Evans said.

Rainfall effects and final thoughts

Beyond temperature, the researchers also looked at how trees responded to rainfall. They confirmed that, even across time and space, more water is better.

“These spatially-based predictions are really dangerous because spatial patterns reflect the end point after a long period in which species have had the opportunity to evolve, disperse, and ultimately sort themselves across the landscape. Because we do,” Evans said. “But that’s not how climate change works. Unfortunately, trees are in a situation where they are changing faster than they can adapt and are actually at risk of extinction. This is a warning to ecologists. .”

References: “Species responses to spatial climate change do not predict responses to climate change,” by Daniel L. Perrett, Margaret EK Evans, and Dov F. Sachs, December 18, 2023. Proceedings of the National Academy of Sciences.
DOI: 10.1073/pnas.2304404120

Funding: Brown University Department of Ecology, Evolution, and Organismal Biology, Brown Institute for the Environment and Society, American Philosophical Society Lewis and Clark Expeditionary and Field Research Fund, Department of Agriculture Forest Service Pacific Northwest Research Station, Department of Energy Oak Ridge Science Institute Education , NSF Macrosystems Biology

Source: scitechdaily.com

Researchers ponder the sorrow of climate change

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“It was a good combination of risk and conveying emotional truth. So I was able to really dig deep and say exactly how I felt in that moment,” he said. Ta.

His rant went viral. He says his employer, NASA, sent him a letter expressing concern about his two arrests.

(“That has to be very clear because I’m speaking on behalf of myself, not as a climate scientist at NASA, which is very important to keeping my job.”) he said in an interview.)

He fears a third arrest could cost him money.

“Will I continue doing science? Or will I continue to participate in dangerous activities and possibly lose my job?” Kalmus said.

Meanwhile, Kalmus is frustrated by the growing number of scientists who are willing to be arrested and not incite protests. And his view of our climate predicament grew increasingly bleak.

“The situation in 2023 feels worse than I thought it would be,” Kalmus said, citing record levels of sea ice in Antarctica as a sign that the Earth system may be changing faster than the scientific community. He pointed out the low temperatures and record heights of sea and land surfaces. I can understand it.

In recent years, climate change has begun to have a negative impact on Calmus’ personal life.

In the summer of 2020, he felt sick while hiking through a California heatwave, witnessed wildfires blazing and plumes of smoke miles from his home in California, and his voice became hoarse and his head hurt. It hurt. The scorching temperatures killed the dogwood tree in my front yard. His productivity decreased and he could no longer focus on science.

Kalmas dreamed of living in the Pacific Northwest, feeling he might be able to escape the worst of climate change. That same year, a three-day heat wave that would have been nearly impossible without the effects of climate change hit the region, killing hundreds of people, buckling roads and causing overheated baby birds to jump from their nests and die.

“That’s when I realized there was no safe place,” Kalmus said. His family moved to North Carolina for his wife Sharon’s job, and his experience planted a seed.

If we can’t stop climate change and we can’t avoid it, can we at least find better ways to survive it?

life in a mansion

Calmus knew what could go wrong.

“I immediately ruled out the idea of ​​being a prepper stocking up on beans and ammunition,” he said.

But he found himself dreaming of a simpler life, where he could keep bees, grow vegetables, squeeze cider on Friday nights, and live closer to the land.

A visit to Possibility Alliance, a sprawling 11-acre farm filled with fruit trees, goats, chickens and gardens, allowed him to scratch an itch he had looked forward to for much of his adult life.

The Hughes family, who run the homestead, and their guests live almost entirely without electricity or modern technology.

The family of four does not fly or own a car due to concerns about the climate. Their main use of fossil fuels is to transport passenger trains to climate protests.

They sought to avoid capitalism and instead created a “gift economy” in this small corner of Maine, where neighbors shared resources and exchanged skills. They grow much of their own food, hold trainings for climate protesters, and plan to take in refugees as the climate disaster worsens.

At night it is illuminated by candlelight. Neighbors stop by without notice.

“We created something that existed 100 years ago,” Ethan Hughes said.

On a humid August morning, Calmus huddles around a faded picnic table in the heart of a farm in Belfast, Maine, sipping a rare varietal of coffee and thinking, like himself, that he’s wary of climate change. I noticed people there.

Source: www.nbcnews.com

Uncovering the Impact of Climate Change on Exoplanets: Transitioning from Temperate to Fear

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Researchers have conducted a new study on the runaway greenhouse effect, revealing how a critical threshold of water vapor could cause catastrophic climate change on Earth and other planets. This study reveals key cloud patterns contributing to this irreversible climate change and provides insight into exoplanets’ climates and their potential to support life. Credit: SciTechDaily.com

The UNIGE team, in collaboration with CNRS, successfully simulated an entire runaway greenhouse effect that could render Earth completely uninhabitable.

Earth is a wonderful blue and green dot covered with oceans and life, Venus It is a yellowish sterile sphere that is not only inhospitable but also sterile. However, the temperature difference between the two is only a few degrees.

A team of astronomers from the University of Geneva (UNIGE) and members of the National Center for Research Competence (NCCR) PlanetS achieved a world first by managing the entire simulation, with support from the CNRS laboratories in Paris and Bordeaux. Achieved. A runaway greenhouse process that could change Earth’s climate from an idyllic environment perfect for life to a harsh and more than hostile place.

Scientists have also demonstrated that from the early stages of the process, atmospheric structure and cloud cover change significantly, making reversing the nearly uncontrollable and runaway greenhouse effect extremely complex. On Earth, an increase in the average temperature of the Earth by a few tens of degrees after a slight increase in the sun’s brightness is enough to start this phenomenon and make our planet habitable.

A runaway greenhouse effect could transform a temperate, habitable planet with oceans of liquid water on its surface into a planet dominated by hot steam hostile to all life. Credit: © Thibaut Roger / UNIGE

Greenhouse effect and runaway scenario

The idea of ​​a runaway greenhouse effect is not new. In this scenario, the planet could evolve from an Earth-like temperate state to a true hell with surface temperatures exceeding her 1000 degrees. Cause? Water vapor is a natural greenhouse gas. Water vapor prevents solar radiation absorbed by the Earth from being re-emitted into space as thermal radiation. It traps some heat like a rescue blanket. A little greenhouse effect would be helpful, but without it, the average temperature of Earth would drop below the freezing point of water, making it a ball of ice and hostile to life.

Conversely, if the greenhouse effect is too strong, it increases evaporation in the oceans and increases the amount of water vapor in the atmosphere. “There is a critical threshold for this amount of water vapor, beyond which the Earth can no longer cool down. From there, everything ramps up until the oceans completely evaporate and temperatures reach hundreds of degrees.” , explains Guillaume Chabelo, a former postdoctoral researcher in the Department of Astronomy at the Faculty of Science at UNIGE and lead author of the study.

Groundbreaking research on climate change

“Other important studies in climatology to date have focused solely on either temperate states before the runaway or habitable states after the runaway,” says a study from the CNRS Institute in Paris and Bordeaux. Martin Tarbet, author and co-author of this paper, explains: study. “This is the first time a research team has used a 3D global climate model to study the transition itself and see how the climate and atmosphere evolve during the process.”

One of the key points of the study explains the emergence of very unique cloud patterns, increasing the runaway effect and making the process irreversible. “From the beginning of the transition, we can observe the development of very dense clouds in the upper atmosphere. In fact, the latter are responsible for the separation of the Earth’s atmosphere and its two main layers, the troposphere and the stratosphere. It no longer exhibits the characteristics of a temperature inversion. The structure of the atmosphere has changed significantly,” points out Guillaume Chavelot.

Serious consequences of searching for life elsewhere

This discovery is an important feature for studying the climate of other planets, especially exoplanets orbiting stars other than the Sun. “By studying the climates of other planets, one of our most powerful motivations is to determine the likelihood of them harboring life,” said Dr. said Emmeline Bolmont, director and co-author of “Extraterrestrial Research” study.

LUC leads cutting-edge interdisciplinary research projects on the origins of life on Earth and the search for life elsewhere in the solar system and beyond planetary systems. “After previous studies, we had already suspected the existence of a water vapor threshold, but the appearance of this cloud pattern is a real surprise!” reveals Emmeline Bolmont. “We also studied in parallel how this cloud pattern produces specific signatures, or ‘fingerprints’, that can be detected when observed. exoplanet atmosphere. The next generation of equipment should be able to detect it, ”he reveals Martin Turbet. The team also doesn’t aim to stop there. Guillaume Chabelo received a research grant to continue this work at the Grenoble Institute for Planetary Observation and Astrophysics (IPAG). This new phase of the research project will focus on specific cases from Earth.

Earth in fragile equilibrium

Using a new climate model, scientists have shown that a very small increase in solar radiation of just a few tens of degrees, leading to a rise in global temperatures, is enough to trigger this irreversible runaway process on Earth. I calculated that. It would make our planet as inhospitable as Venus. One of the current climate goals is to limit global warming caused by greenhouse gases to just 1.5 degrees Celsius by 2050. One of the problems with Guillaume Chavelot’s research grant is to determine whether a small increase in greenhouse gases could cause a runaway process. The brightness of the sun may be enough. If so, the next question becomes determining whether the threshold temperatures for both processes are the same.

Therefore, Earth is not far from this apocalyptic scenario. “Assuming this runaway process begins on Earth, evaporation of just 10 meters of ocean surface would raise atmospheric pressure at the surface by 1 bar. Within just a few hundred years, surface temperatures would exceed 500°C. Then the surface pressure would rise to 273 bar, the temperature would exceed 1500 degrees, and eventually all oceans would completely evaporate,” concludes Guillaume Chavelot.

Reference: “First Exploration of Runaway Greenhouse Transitions Using 3D General Circulation Models” by Guillaume Chaverot, Emeline Bolmont, and Martin Turbet, December 18, 2023. astronomy and astrophysics.

Exoplanets in Geneva: 25 years of expertise wins Nobel Prize

The first exoplanet was discovered in 1995 by two University of Geneva researchers, Michel Mayor and Didier Queloz, who won the 2019 Nobel Prize in Physics. With this discovery, Department of Astronomy, University of Geneva The construction and installation of has put us at the forefront of research in this field. harp upon ESO3.6 meter telescope at La Silla in 2003.

For 20 years, this spectrometer was the world’s most powerful at determining the masses of exoplanets. However, HARPS was surpassed in 2018 by ESPRESSO, another Earth-based spectrometer built in Geneva. very large telescope (VLT) Paranal, Chile.

Switzerland is also working on space-based exoplanet observations with the CHEOPS mission. This is the result of the expertise of two countries. University of Bern, the on-ground experience of the University of Geneva in collaboration with the universities of Geneva and with the support of the universities of the Swiss capital. These two areas of scientific and technical expertise are PlanetS National Center for Research Capability (NCCR).

Life in the Universe Center (LUC): A pillar of interdisciplinary excellence

of Life in the Universe Center (LUC) is an interdisciplinary research center at the University of Geneva (UNIGE), established in 2021 following the 2019 Nobel Prize in Physics awarded to Professors Michel Mayor and Didier Quelot. Thanks to advances over the past decade in both the fields of solar system exploration, exoplanets, and the organic structure of life, it is now possible to address the question of the emergence of life on other planets in a concrete way. Ta. It’s no longer just a guess. Located at the intersection of astronomy, chemistry, physics, biology, and the earth and climate sciences, LUC aims to understand the origin and distribution of life in the universe. Led by the Department of Astronomy, LUC brings together researchers from numerous institutes and departments at UNIGE, as well as from our international partner universities.

Source: scitechdaily.com

Scientists Develop New “Cooling Glass” to Combat Climate Change by Channeling Heat from Buildings into Space

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Innovative “cooling glass” developed by researchers at the University of Maryland provides a groundbreaking, non-electrical solution for reducing indoor heat and carbon emissions, and significantly advances sustainable building technology. It shows great progress.

Applying new coatings to exterior surfaces can reduce air conditioning usage and help fight climate change.

Researchers at the University of Maryland have developed an innovative “cooling glass” designed to reduce indoor temperatures without using electricity. This revolutionary material works by harnessing the cold air of outer space.

New technology, microporous glass coating, described in paper published in the journal sciencecan lower the temperature of the material beneath it by 3.5 degrees. Celsius According to a research team led by distinguished professor Liangbing Hu of the university’s School of Materials Science and Engineering, it has the potential to reduce the annual carbon dioxide emissions of mid-rise apartments by 10%.

Cooling mechanism with two functions

This coating works in two ways. For one, it reflects up to 99% of solar radiation, preventing buildings from absorbing heat. Even more interestingly, this universe emits heat in the form of long-wave infrared radiation into the icy universe, whose temperature is typically -270 degrees Celsius, or just a few degrees warmer. absolute temperature.

In a phenomenon known as “radiative cooling,” spaces effectively act as heat sinks for buildings. They use new cooling glass designs and so-called atmospheric transparency windows (the part of the electromagnetic spectrum that passes through the atmosphere without increasing its temperature) to dump large amounts of heat into the infinitely colder sky beyond. Masu. (Although the emissions are much stronger than those from the new glass developed at UMD, the same phenomenon causes the Earth to cool itself, especially on clear nights.)

State-of-the-art durable materials

“This is an innovative technology that simplifies the way we keep buildings cool and energy efficient,” said research assistant Xinpeng Zhao, lead author of the study. “This could help us change the way we live and take better care of our homes and the planet.”

Unlike previous attempts at cooling coatings, the new glass developed by UMD is environmentally stable, withstanding exposure to water, UV light, dirt, and even flame, and withstands temperatures up to 1,000 degrees Celsius. can withstand. Because glass can be applied to a variety of surfaces such as tile, brick, and metal, the technology is highly scalable and can be adopted for a wide range of applications.

The research team could use finely ground glass particles as a binder, bypassing polymers and increasing long-term durability outdoors, Zhao said. We then selected a particle size that maximizes the release of infrared heat while reflecting sunlight.

Climate change solutions and global impacts

The development of cooling glass is in line with global efforts to reduce energy consumption and combat climate change, Hu said, adding that this year’s Independence Day could have been the world’s hottest day in 125,000 years. He pointed out recent reports that it was a day of sex.

“This ‘cooling glass’ is not just a new material, it’s an important part of the solution to climate change,” he said. “By reducing the use of air conditioners, we have taken a big step towards reducing energy usage and reducing our carbon footprint. This is because new technology is helping us build a cooler, greener world. It shows how it can help.”

In addition to Hu and Zhao, Jelena Srebric and Zongfu Yu, professors of mechanical engineering in the University of Wisconsin-Madison’s Department of Electrical and Computer Engineering, are co-authors of the study, each contributing expertise in CO2 reduction and structural design. There is. .

The team is now focused on further testing and practical application of the cooled glass. They are optimistic about its commercialization prospects and have formed a startup company, CeraCool, to scale and commercialize it.

Reference: “Solution-processed radiatively cooled glass” Xinpeng Zhao, Tangyuan Li, Hua Xie, He Liu, Lingzhe Wang, Yurui Qu, Stephanie C. Li, Shufeng Liu, Alexandra H. Brozena, Zongfu Yu, Jelena Srebric, Liangbing Written by Hu, November 9, 2023, science.
DOI: 10.1126/science.adi2224

Source: scitechdaily.com

Making this simple dietary change may impact your blood pressure

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New research shows that cutting back on salt can significantly lower your blood pressure, whether you have hypertension or are on medication. The study, which included 213 participants from diverse backgrounds, found that a low-salt diet lowered systolic blood pressure by an average of 7 mmHg. These results apply to a wide range of individuals and suggest that salt restriction is as effective as common hypertension medications in controlling blood pressure.

Research has shown that a low-salt diet significantly lowers blood pressure and is beneficial for people with and without high blood pressure, and even for people taking blood pressure medications.

  • Reducing sodium intake significantly lowered blood pressure in most people, even those who were already taking blood pressure medications.
  • The findings suggest that reducing sodium intake may have health benefits for a wide range of people.

Half of Americans have high blood pressure. If the systolic reading (the upper number, the pressure at which blood is pumped out of the heart) is consistently above 130 mm Hg, or the diastolic reading (the lower number, the pressure when the heart is filling with blood) Blood pressure is considered high if the pressure between heartbeats) exceeds 80 mm Hg. mmHg or higher.

Role of sodium in hypertension

Sodium is essential for the human body, but too much sodium can cause high blood pressure. However, blood pressure sensitivity to sodium varies from person to person. This makes it difficult to determine what counts as a healthy amount of sodium in someone’s diet. Also, most studies on low-salt diets exclude people who take blood pressure-lowering medications. Therefore, it is unclear how much salt reduction affects people taking these drugs.

Research on dietary sodium and blood pressure

An NIH-funded research team led by Dr. Deepak Gupta of Vanderbilt University Medical Center studied the effects of dietary sodium on blood pressure in 213 people (65% female, 64% black) between the ages of 50 and 75. Both normotensive and hypertensive participants were enrolled from April 2021 to February 2023 in Chicago, Illinois, and Birmingham, Alabama. Some were taking medication to control high blood pressure.

Participants were randomly assigned to either a high-sodium diet or a low-sodium diet for one week. Those on a high-sodium diet added 2,200 mg of sodium per day to their regular diet. Those on a low-salt diet were provided with a week’s worth of low-sodium meals, snacks, and drinks. This diet provided an average of 500 mg of sodium per day.

The researchers measured the participants’ blood pressure a week later. The participant was then switched to another diet for one week and her blood pressure was measured again. Blood pressure was the average value she measured over a 24-hour period during normal daily activities. The results were: Japan Automobile Manufacturers Association November 11, 2023.

Important discoveries and implications

Almost 75% of participants had lower systolic blood pressure on the low-sodium diet than on the high-sodium diet, with an average decrease of 7 mmHg. Compared to a regular diet, the low-sodium diet lowered systolic blood pressure in 72% of participants, with an average drop of 6 mmHg. The effect of dietary sodium did not depend on whether a person had high blood pressure in the first place. It was also unaffected by whether people were taking medication for high blood pressure.

This reduction in blood pressure can have significant health benefits. This finding supports reducing sodium in the diet to lower blood pressure. The effects of a low-salt diet were similar to those of common first-line drugs for hypertension. The results also suggest that reducing salt intake may help a wide range of people, including those already taking blood pressure-lowering drugs.

“Just as any physical activity is better than none for most people, reducing salt from your current normal diet is likely to be better than none,” says Gupta. To tell.

For more information about this study, see New study reveals universal blood pressure-lowering strategy.

Reference: “Effects of dietary sodium on blood pressure: a cross-over study”, Deepak K. Gupta, Cora E. Lewis, Krista A. Varady, Yan Ru Su, Meena S. Madhur, Daniel T. Lackland, Jared P. Reis , Thomas J. Wang, Donald M. Lloyd-Jones, Norina B. Allen, November 11, 2023, Japan Automobile Manufacturers Association.
DOI: 10.1001/jama.2023.23651

Funding: NIH’s National Heart, Lung, and Blood Institute (NHLBI), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Cancer Institute (NCI), and National Center for the Advancement of Translational Sciences (NCATS). American Heart Association.

Source: scitechdaily.com