Environment Colorado.com
This site is really awesome. If you join organization (for free!), they'll send you emails with all kinds of important stuff, for example- the recent Endangered Species Act proposal. They send letters to the government that you can edit yourself. I think it's a great resource for people who want to act against the destruction of the environment or learn about green living. Check it out! Here's some info from the site:
"Environment Colorado is a statewide, citizen-based environmental advocacy organization. Our professional staff combines independent research, practical ideas and tough-minded advocacy to overcome the opposition of powerful special interests and win real results for Colorado's environment. Environment Colorado draws on 30 years of success in tackling our state's top environmental problems."
"Environment Colorado's Grassroots Member Program is a free, easy, powerful way to make an impact on the issues you care about and stay in contact with us."