A new study from Columbia University’s Lamont-Doherty Earth Observatory reveals that a northward shift of Earth’s wind and rain belts could make a broad swath of regions drier. The findings, published in Proceedings of the National Academy of Sciences, show that these drier regions include the Middle East, American West and Amazonia, while Monsoon Asia and equatorial Africa will become wetter as humans continue to heat the planet. Temperatures may warm as the air pollution in the northern hemisphere declines. This may create the kind of temperature contrast that could move the winds and rains north again, said Jeff Severinghaus, a climate scientist at Scripps Institution of Oceanography at UC San Diego. Severinghaus was not involved in the study.