Newswise: University of Arkansas researchers and their colleagues have examined recent climate patterns in Mexico and determined that the country underwent severe drought conditions between 1994 and 2008, and that human changes related to land use and global warming may have aggravated the dry, warm conditions. “This is one of the worst droughts in Mexico in the instrumental record,” said David Stahle, Distinguished Professor of geosciences at the University of Arkansas. Stahle, …