“Global warming sounds so big that it’s hard to imagine that you as an individual can do anything about it (“what I do is such a tiny drop in the bucket it doesn’t matter anyway”). But that’s where you’re wrong: the reason Earth is in peril is because of individual actions—by me, by you, by the person sitting next to you, by the person you bump into on the street.

The bad news is that when we put all those individual actions together, it becomes one huge number—big enough to change climate, big enough to change how Earth supports life. The good news—the very good news—is that, just as the problem is the sum of what each one of us is doing, so is fixing the problem.”
– Anthony D. Barnosky, Heatstroke: Nature in an Age of Global Warming