Farmers Worldwide Struggle to Adapt to Climate Change

Despite farmers’ best efforts to adapt, increasing global temperatures have the potential to significantly impact the world’s essential crops. Comprehensive analysis indicates that by the century’s end, for every degree of warming, global food supply may drop by nearly 121 kcal per person per day.

In a 3°C warming scenario—aligned with current trends—”It might mean skipping breakfast for everyone,” notes Andrew Hartgren from the University of Illinois, Urbana-Champaign.

Hartgren and his team gathered data on the yields of six major staple crops globally, which account for over two-thirds of the world’s calories. “This represents one of the largest datasets currently available for high-resolution crop yields,” he states. They also incorporated local weather information from 54 different countries.

The researchers utilized this data to forecast how various crops would respond to climate changes and how farmers might adapt. “We examined historical data on how farmers have reacted to weather fluctuations,” Hartgren explains. This approach enabled the team to assess how different agricultural strategies might mitigate losses, like crop variety adjustments, enhancing irrigation, or increasing fertilizer use.

Except for rice, which thrives under warmer nighttime conditions, higher temperatures generally lead to considerable yield reductions. For instance, global corn yields are anticipated to decline by about 12% to 28% by the century’s end, contingent upon whether greenhouse gas emissions are moderate or extremely high compared to projections without climate change.

These statistics illustrate how farmers adjust to rising temperatures and the implications of potentially beneficial effects of climate change, like elevated carbon dioxide levels fertilizing crops. Both factors are significant. Without adjustments, for example, crop losses could reach a third by the century’s end under extreme warming scenarios, yet this won’t mitigate the majority of losses. “In a warmer future, the corn belt will still be relevant,” Hartgren asserts.

Wolfram Schlenker of Harvard University emphasizes that agricultural adaptations seldom completely offset crop losses due to climate change, with previous studies from specific regions suggesting similar conclusions. “The major strength of their research is its global perspective, compiling data from numerous countries,” he remarks.

The global approach reveals some fascinating patterns. For example, researchers observed that the most significant projected crop losses are not concentrated in low-income nations but rather in comparatively affluent agricultural hubs like the Midwest and Europe. “They aren’t inherently better suited than poorer countries,” Schlenker notes.

Michael Roberts from the University of Hawaii Manoa states that these findings align with the conclusions of a smaller study. However, he highlights considerable uncertainties, such as the extent of future climate change and the complexities of global food systems’ responses.

“What’s alarming is our lack of knowledge,” Roberts adds. “There’s significant uncertainty, much of which is negative. Losses could range from non-existent to catastrophic, potentially causing massive famines. It’s a sobering thought for many.”