As usual, James Lileks nails it

From The Bleat:

I think a lot of people who lived their lives in a quivering state of imminent ecological collapse-panic have moved those emotions from that box into this one, and feel energized because the dread now seems even more imminent, and they have Science! on their side, and their enemies are all the right enemies, and this time they can make a difference. And it requires nothing.