Today is Earth Day, and here on ScienceBlogs our bloggers are observing it by sharing their reasons for caring about our planet and its environment. ScienceBlogs' newest blog, Guilty Planet, launched today in timing with the occasion. Written by Jennifer Jacquet, formerly of Shifting Baselines, the blog will explore human patterns of consumption and what can be done to make them sustainable. "It will seek reason amidst the irrational madness of destroying one's only home," writes Jacquet. Also check out Mike Dunford's Earth Day meme on The Questionable Authority and a meditative audio slideshow of scenes from Planet Earth, Ear to the Ground, on SEEDMAGAZINE.COM.