The connection between climate change and extreme weather hurricanes, tornadoes, floods and droughts is one scientists have struggled with for years. But there's no doubt that 2011 was a memorable year for natural disasters. From the freakish string of tornadoes that hit the Midwest to the ongoing Texas drought to the tropical storms of August, the U.S. was buffeted by extreme weather throughout the year. Fourteen $1 billionplus natural disasters hit the U.S. in 2011 an all-time record.
Of course, the cost of a natural disaster isn't a measure just of the strength of a tornado or a hurricane. As population and income grow and especially, as people and wealth concentrate in vulnerable areas like the coastline the economic and human toll from any given disaster is likely to increase. Add in climate change, which can put ordinary weather on steroids, and we're going to be facing a future in which the billion-dollar disaster becomes all too common.