Scientists study all the ways hurricanes are likely to change in this century as Earth gets warmer. They also want to know – and this is a hard question to answer – if hurricanes are already being affected by the Earth warming that’s happened thus far. This week, scientists at the University of Wisconsin weighed in with a new analysis of nearly 40 years of satellite imagery of hurricanes. Their results say that – over the past four decades – hurricanes have become more intense and destructive.