Was wondering if you saw the new Discovery channel "Planet Green" yet? Though I wish they made an HD version the channel is great and informative. It has a lot of good shows.
Greensburg is a cool show on there. A midwestern town hit and destroyed by a tornado now this town is being built as the first green model community in the world, how amazing is that?! here is the link:
http://planetgreen.discovery.com/tv/greensburg/You like survivor man on Science channel? He has a show on there now called "off the grid" pretty cool.
Now my 4 favorite channels, Science - National Geographic - Planet Green - History.