Yesterday's severe weather in New York has got everyone here talking about global warming. A tornado in Brooklyn? Get outta here! (Nonetheless, you see the photographic evidence above. Photo by Samantha Vuignier.) What we had in New York yesterday was technically called a mesoscale convective system, a term I learned in this story from Wired. I'm no scientist, but I do know it's hard to connect single events and storms with global climate change. Yet perhaps our local flooding does fit in with a worldwide pattern of severe weather this year. That, at least, is something photographs can show us. National Geographic has conveniently packaged a portfolio of storm damage and flooding from around the globe in 2007. Go here. So, what do you think? Do all these images add up to global warming?