PopSci: Here's your latest global warming update: It's still happening. Intense heat is now four times more likely to strike in the U.S. than it was in pre-industrial times, according to a new study from Stanford University researchers.
July 2012 was the hottest month on record in the lower 48 states, and the summer brought the "most severe and extensive drought in at least 25 years," according to the USDA. And it seems summers like last year's are going to become more commonplace, with 2012-esque temps...