I stumbled across a site called TerraPass that really blew me away. By purchasing a so-called TerraPass at a cost equivalent to your car's annual emissions (mine was $150. but most are less), you are guaranteed to reduce Carbon Dioxide emissions elsewhere in the world by that amount. It's a fabulous idea, and I joined. If the US government wants to really do something about Global Warming - mandating this for all US cars - or even just for all SUVs would be a great start. That and funding alternative fuel research and moving toward energy independence is something we must do.