At any given moment we face as a society an enormous number of problems: there’s the mortgage crisis, the health care crisis, the endless war in Iraq, and on and on. Maybe we’ll solve some of them, and doubtless new ones will spring up to take their places. But there’s only one thing we’re doing that will be easily visible from the moon. That something is global warming. Quite literally it’s the biggest problem humans have ever faced, and while there are ways to at least start to deal with it, all of them rest on acknowledging just how large the challenge really is.
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