Leave no footprints, especially the carbon kind

To minimize our impact on the environment, while in the field, some say 'take only photos, leave only footprints'; a good adage to be sure. We say, 'Record some sounds, and reduce your carbon footprints, too, whenever and wherever you can.' Brighterplanet.com is doing some interesting campaigns in support of renewable energies and offers a nice bit of offset just by posting their badge to your blog.