Slate: Global warming is real, and we're starting to feel the physical effects now. It's difficult to pin any one event on a warming world; it's like playing craps with a pair of loaded die. That 12 you rolled may have been random, or it may have been because the dice are very slightly weighted. You have to throw a lot of rolls before the effects are seen with any certainty.
But these physical effects on our planet are just the start. Droughts, fires, more extreme weather, sea level rise, ocean acidification...