Below is the Yahoo! list and then a link to all related posts on this topic on Endangered Spaces blog.
1. Recycling - related posts on Endangered Spaces blog in the past year
2. Global Warming - related posts on this blog
3. Freecycle - *see below
4. Earth - all posts on Endangered Spaces blog are related to the Earth
5. Pollution - related posts
6. Al Gore - related posts
7. Environmental Protection Agency - related posts
8. Live Earth - related posts
9. Hybrid Cars - related post
10. Solar Energy - related posts
Note: I will find information about the topic freecycle and write a post on this topic within the week.