As U.S. citizens, we have a special responsibility. Though we make up just 5 percent of the world's population, we produce 25 percent of total greenhouse gas emissions. What can you do?

Go ZeroCarbon for just $8.25 per month to offset your entire climate impact -- including all of the indirect carbon emissions caused by purchasing products such as clothes, food, your iPod, everything -- and Working Assets will offset an extra 5 tons FREE!!!