Global warming by just 2 degrees Celsius is likely to force some tropical plant, animal and human populations to relocate hundreds of miles from their current homes this century, according to research published in the journal Scientific Reports. Solomon Hsiang, Chancellor’s Associate Professor of Public Policy at the University of California, Berkeley, and Adam Sobel, a professor of applied physics and math at Columbia University, foresee dramatic population declines in Mexico, Central America, Africa, India and other tropical locales if ecosystems or humans move due to climate change.