A string of natural disasters has hit the central U.S. in recent weeks. Tornadoes have devastated communities, tearing up trees and homes. Record rainfall has prevented countless farmers in America's breadbasket from planting crops. Rising rivers continue to flood fields, inundate homes and threaten aging levees from Iowa to Mississippi. And while none of these events can be directly attributed to climate change, extreme rains are happening more frequently in many parts of the U.S. and that trend is expected to continue as the Earth continues to warm.