In the spirit of Knitters Against Global Warming, here's an interesting thing I heard about today:
Tomorrow, September 21st, is Park(ing) Day, a day to call attention to the lack of green space in our cities. There are about 20 spaces to be set up in NYC, but there are others around the nation too if you don't happen to live in the Big Apple. If you happen to be nearby one of them, go take a stroll!
via No Impact Man
More info on Park(ing) Day here
And google map of all NYC park(ing) spots here