The individual commitments made by parties of the United Nations Paris Agreement are not enough to fulfill the agreement’s overall goal of limiting global temperature rise to less than 2 degrees Celsius above pre-industrial levels. The difference between the U.N. goal and the actual country commitments is a mere 1 C, which may seem negligible. But a study from Stanford University, published Feb. 14 in Science Advances, finds that even that 1-degree difference could increase the likelihood of extreme weather.