And then you read this, which basically confirms a lot of my longstanding worries as to the difference little people like us can make (such as not putting in air conditioning, making us possibly the last house in our street without it). (Short answer: no difference at all. Which is not to say we shouldn't keep doing those little things we can do.)
Act locally = good.
Think globally = depressing.
It seems to me that all we can do now is put our faith in scientists and entrepreneurs to come up with a sudden, dramatic solution comparable to putting a man on the moon. Oh. We did that.
[p.s. I don't really like Tom Friedman's tone, for some reason that I can't put a finger on, but I have always known more after reading his column than I knew before, and it is kind of the New York Times to once again make his stuff available to concerned cheapskates like me.]