Extreme rainfall and flooding have left paths of destruction through communities around the world this summer. In New York City, remnants of Hurricane Ida flooded streets and subway lines as more than 3.15 inches of rain fell in an hour and more than 7 inches fell in all on Sept. 1-2, 2021. A week earlier in Tennessee, a record-shattering 17 inches of rain fell in 24 hours, turning creeks into rivers that flooded hundreds of homes and killed 20 people. A lot of people are asking: Was it climate change? Answering that question isn’t so simple.