GreenYour.com

Carbonfund.org lets you offset emissions from air and car travel, home energy, and even your wedding. For $99, you can go 100 percent carbon neutral through the group's ZeroCarbon program (offsetting the estimated 50,000 pounds of carbon the average American is responsible for annually). Carbonfund.org also offers businesses and organizations a chance to go carbon-free. Offset dollars help fund reforestation and renewable energy projects.