If you've ever seen Judith Helfund's documentary, "Blue Vinyl" you'll wonder why Habitat for Humanity was included in this list of eco-friendly organizations to help rebuild the devastation down south.  In the past (and especially down south) HFH has included a heck of a lot of vinyl materials in their building--including homes built completely out of vinyl 2x4s.  I hope they've stepped away from that since the production of vinyl is known to have contaminated surface and ground water down there--and hurt many of the people who work in the plants. Check it out at http://www.bluevinyl.org