AI-Driven Route Planning Reduces Climate-Warming Contrails on Over 100 Flights

Impact of Contrails on Global Warming

Contrails Major Contributors to Air Travel’s Global Warming Impact

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A comprehensive study examining thousands of flights between the United States and Europe revealed that contrails—those vapor trails left by aircraft—are less likely to form when planes follow artificial intelligence (AI)-recommended flight paths aimed at minimizing their global warming impact.

Contrails, created from soot particles emitted by aircraft engines, are believed to contribute significantly to warming, potentially surpassing the effects of carbon dioxide alone. Recent research indicates that certain icy areas in the upper atmosphere are more prone to contrail formation, and AI technology can predict these zones using detailed weather forecasts.

Despite the promising results from small-scale trials where aircraft avoid these high-contrail areas, such practices have not yet been widely implemented in commercial aviation.

In the study, Dinesh Sanekom and colleagues from Google utilized an AI-controlled contrail prediction tool to advise on flight routes in a randomized controlled trial involving over 2,400 flights with American Airlines.

This trial included overnight flights from the U.S. to Europe and spanned approximately 17 weeks, from January to May 2025. These flights specifically targeted nighttime, as contrails have an intensified warming effect during these hours due to reduced sunlight that reflects back into space during the day.

Flight routes between certain city pairs were randomly divided into two groups. The first group had the option to select an AI-optimized route that would result in fewer contrails, while the second group received no alternative route suggestions.

Although dispatchers were offered the opportunity to choose contrail-minimizing routes within the first group, only 112 of the 1,232 flights opted for these alternatives, primarily due to operational considerations such as cost and safety, Sanecom noted.

Analysis using satellite imagery of the flight paths indicated that flights adhering to AI-suggested contrail-optimized routes experienced a remarkable 62% reduction in visible contrails. When considering all flights that could have chosen these optimized routes, the overall decrease in contrail formation reached 11.6% compared to the control group.

“This supports our hypothesis that there is a scalable approach to implementing contrail avoidance across numerous flights if we can integrate it effectively and safely into flight planning,” Sanecom asserts.

Researchers calculate the global warming impact of air travel was diminished by 13.7% for the entire group utilizing the suggested routes, while flights using the optimized routes saw a substantial 69.3% decrease. Notably, no significant variations in fuel consumption were recorded between the groups.

“This approach is currently the most effective with the tools available,” states Edward Griespeerdt from Imperial College London. “The observed 62% reduction in contrails is unlikely to have occurred by chance.”

However, due to the intricacies of flight planning, it’s uncertain how much the 11.6% reduction could be realized in actual commercial operations, he added. “Scaling this to achieve a 60% reduction in contrails on every flight isn’t straightforward, but even a 10% reduction could yield a meaningful impact.”

Article updated on March 20, 2026

This article has been revised to reflect more accurate information regarding flight path modifications.

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Source: www.newscientist.com

Sahara Dust Clouds Suffocating the Caribbean en Route to the U.S.

San Juan, Puerto Rico – Enveloped in a significant amount of dust clouds from the Sahara Desert, the Caribbean is headed towards the US on Monday for one of the year’s most noteworthy events.

These clouds have expanded from Jamaica, stretching approximately 2,000 miles (3,200 kilometers) past Barbados in the Eastern Caribbean, and about 750 miles (1,200 kilometers) from the Turks and Caicos Islands down to Trinidad and Tobago.

“It’s quite remarkable,” noted Alex Dasilva, a hurricane expert at Accuweather.

The hazy skies have triggered sneezing, coughing, and watery eyes throughout the Caribbean. Local meteorologists are advising individuals with allergies, asthma, or other respiratory issues to stay indoors or wear face masks when outside.

Idiana Zayas, a forecaster at the National Weather Service in San Juan, Puerto Rico, reported elevated dust levels.

As per the National Oceanic and Atmospheric Administration, an aerosol’s optical depth quantifies how many particles obstruct sunlight from reaching the ground.

The plume is anticipated to reach Florida, Louisiana, Alabama, and Mississippi later this week and over the weekend, Dasilva mentioned.

However, he indicated that plumes often lose much of their density in the Eastern Caribbean.

“These islands typically face higher concentrations that can partially block sunlight, leading to more noticeable effects,” he remarked.

The dry, dusty air known as the Saharan air layer originates from the African Sahara Desert and travels westward from around April to October, according to NOAA. It also hinders the formation of tropical waves during the Atlantic hurricane season, which runs from June 1 to November 30.

June and July generally see the highest average dust concentrations, with plumes moving between 5,000 and 20,000 feet above ground, Dasilva pointed out.

In June 2020, record levels of Sahara dust filled the Caribbean. The scale and density of the plume were unprecedented in half a century, prompting forecasters to label it the “Godzilla Dust Cloud.”

Source: www.nbcnews.com

Trekking from Cactus to Cloud Route in Palm Springs, California.

A steep trail near the top Aerial Trams in Palm Springs It was covered with a sponge-like fallen needle and wist-strung pine cone on its ankle. It was also shady, and although it was tough, it felt amazing after the first 7 miles Cloud hiking from cactus Not much was offered bird The value of the remedy of the Leaf.

I was already hiking 7,549 feet vertical feet, and had about 3,000 to get to the top of Mount San Jacinto, a granite rock mountain that towers just west of Palm Springs, California.

For this, I chose the third time from the cactus to the cloud hike, and I chose the day in mid-November, but the conditions were perfect. The 22-mile hike has risen from the desert floor to a 10,834-foot peak, then six miles and 2,400-foot vertical feet, reaching a $14 ride.

I started trekking at an altitude of 482 feet near the Palm Springs Museum Immediately after sunrise At 6:41am, carrying enough water to continue to the first water source, the 8,400-foot ranger station, I packed some jackets to deal with the swing of wild temperatures from bottom to top.

People have many reasons to try cacti on clouds. This is one of the most biodiversity hikes in the country. It is a rare wilderness experience on the edge of an urban area. But more than anything, there is the pure boldness of the hiking. In my previous ascension, each of them was motivated by the idea that, following the diagnosis of multiple sclerosis, divorce and completion of treatment for stage 3 breast cancer, I was not sorry for myself by committing myself to this challenge. And what if I made it? Well, that was proof that I could handle anything.

This time my MS was in remission, my marriage was fulfilling, and I had been cancer-free for almost nine years. More than 15 years after the first cactus to the clouds, it was finally about the landscape, not me. I had hidden pocket guides to plants in the San Jacinto Mountains and had planned to take some time to stop the cedars and smell them.

The cloud route from full cactus is only very suitable, but you can also hike that section. Walk one mile from the trailhead to the picnic area and look back. Or take the tram and take the Top Station, then climb the summit on Mount San Jacinto. You can also trek to the top of the tram and then take it on and save the next day’s summit, as you did this time due to sudden leg pain. Each offers you the chance to find eternal views of the Coachella Valley, as well as the Cactus Lens, the Cooper Hawks and the Golden Eagles.

Mount San Jacinto is not particularly noticeable, but the difference in altitude from the base to the summit is the case. The mountain rises approximately 10,400 feet over approximately six horizontal miles. This sudden trend explains the unusual species of life of plants passing through four life zones, apart from the roughly climbing equivalent of Mount Everest.

The trail begins between desert species such as barrel cactus and creosote, and then Chaparal, Scrub oak and Manzanita. After that, the pine forests mix together. At the summit, the trees are shorter, collected and included by altitude and elements. Pines on the arms and legsthrives in places that are hardly anywhere else.

“The environment and lifestyle look very different from the top of Mount San Jacinto in the desert of Colorado Sonoran,” he said. Conservation Biology Center A few days before hiking at the University of California, Riverside. But the most interesting is the zones between the zones, she said. “That’s where it is the most biodiversity is.”

Davis was right. Between 7,000 and 8,000 feet, the green smelled a variety of things, resulting in an incredible array of shapes, textures, hues and sizes. It was like hiking a bowl of mixed salad greens: cedar, manzanita, oak, agave Jeffrey Pines Add a butterscotch hint into the air.

Conditions that make cactus prominent towards the clouds dangerous. The trail hiker died of dehydration and exposure. “We take one deadly a year,” said volunteer Eric Holden. Riverside Mountain Rescueone of four search and rescue teams to deal with hikers suffering on the route.

To protect both hikers and rescuers, Mount San Jacinto State Park In summer, parts of the route were closed under authority (three digit temperatures at the bottom) and winter (snow and frozen conditions at the top). In 2024, the trail closed in early July and reopened on November 4th.

There is little shade for the first 7,000 feet and no ten miles of water. “One of the biggest killers is a hiker who has come to realize he has no physical fitness and is beginning to turn around,” Holden said. “It might be cool when it started at 3am, but now I’m not feeling well and I’m hiking to temperatures that could go above 100 degrees.”

In winter, snow can make it difficult to track. In particular, at 1,000 feet, 1,000 feet below the top of the tram, hikers are stuck on a cliff. I stayed on the path of this section by following my previous GPS tracks from cactus to cloud hiking.

Backpacker magazine Call the cactus to cloud the hike on the fifth most difficult day in America. Most hikers take 12-16 hours. I tried to entertain myself from the relentless climb by identifying exactly which species of Manzanita was scratching my feet, but it did so much to deflect me. I sat down, sitting on a flat rock 6,000 feet above the trailhead, next to either a pink business or a green leaf manzanita.

At least I was hiking uphill. Most veteran hikers understand that while ascending is a tough job, going downhill is a real punishment. In fact, there are clouds from cactus to clouds. Because much of the descent occurs on the streetcars.

“We were dedicated to hikers and were always looking for challenges,” said Sue Birnbaum, one of the six members of the group. Coachella Valley Hiking Club He was the first person to complete the annual Cactus to Clouds Challenge in 1993.

The challenge linked three existing trails, which are “extraordinary super day hikes.” The Museum, Skyline and Mount San Jacin To Peak Trail go beyond a mixture of local, state and federal land and property owned by the Agua Caliente India reservations, which have been operating since 1963.

One paradox of cactus to clouds: better if there are no clouds. They obscure the scenery and sometimes the trail itself. This rise held a different kind of paradox for me too. It was the first time I’d hiked separately on the summit trail, but as I listened to my body and spared my legs, I felt a surge in pride.

Against the Pacific panorama, sparkling Salton Sea, and the peaks of the terrible sacred Takitz, spectacular cauliflower-shaped clouds floated thousands of feet below. At about 90 minutes of sunset, they caught and reflected the shades you can usually see in a mango ice cream scoop.

Despite the warm orange radiating across the sky, the summit was frozen and gusts of wind had collapsed. I was tied up in three jackets containing a hooded, swollen coat and would have happily accepted another. So I wanted as much as I wanted to last longer, and I wanted even more to avoid frostbite.

I headed back from the rocks back onto the trail and turned myself towards the tram and across the cluster of things I had identified. Bush Chin Capin. My pocket guide said the fruit tastes like chestnuts. The next time you do the cactus on the clouds, always stop and try it.

The trail is located just north of the Palm Springs Museum, approximately 6.5 miles from the foot of the tram car. After the hike, you can use ride services such as Uber or Lyft to return to the trailhead parking lot.

Source: www.nytimes.com