Check out this cool site: terrapass.com. Based upon the car you drive, you can make quarterly payments that will go to subsidize the development of new windfarms. It's a way to make up for the carbon dioxide emissions we make by driving throughout the year.

I'm not exactly sure how these 'green e-credit' organizations work, or how effective they are overall. My impression is that by purchasing wind power through a third party, we're creating demand for a renewable resource. This will encourage more development of windmills, make the technology cheaper, and improve the technology through further investment.

There are also numerous places to purchase green energy to offset our use at home!