Rainwater:
http://www.gardengatemagazine.com/52droughttolerant/
Greywater:
http://greywateraction.org/contentabout-greywater-reuse/\
Passive Solar:
https://www.youtube.com/watch?v=Prx6rJPZFIE
Permaculture:
http://www.permaculture.net/about/brief_introduction.html
No-till Gardening:
http://www.motherearthnews.com/homesteading-and-livestock/no-till-farming-zmaz84zloeck.aspx
Clay Building:
http://www.earthhomesnow.com/clay-houses.htm
Ocean Energy
http://inventors.about.com/od/tstartinventions/a/tidal_power.htm