So far, Brighter Planet has given away over 3,700 gifts and offset more than 504,000 pounds of CO2. The goal is to give away 5,000 One Day gifts and offset 680,000 pounds of CO2. Per their site:
The average American emits 136 pounds of carbon dioxide each day. About 36 pounds come from driving, flying, and other travel. Another 22 pounds come from heating, cooling, and powering our homes. The final 78 pounds come from producing, transporting, and disposing of all the stuff we buy, and from shared services like schools and street lights. 136 pounds would fill 5,000 balloons — imagine releasing that every day.
To me, its definitely worth signing up. Did I mention its free? Thanks to Zeldman for the post and passing it on to the rest of us.