Well, I guess a Sequoia anyway.
I learned about WikiaGreen from ecofabulous, and I immediately added a bunch of entries about the Marin Farmer's Market Association. One of the admins asked me to be an admin, and I regretfully declined as I can't even imagine what a timesuck that would be, but I promised to contribute more when I could.
If you have the gumption, add your local farmer's markets, or anything else that makes your aunt call you a "tree-hugger" on your blog. :-)