Environmental+sites

http://www.nrdc.org/air/cleanairact/?gclid=CLTI-pPgga0CFYvDKgodSw90Rg

http://www.ucpress.edu/book.php?isbn=9780520243286

http://en.wikipedia.org/wiki/Ecological_crisis

http://www.globalresearch.ca/index.php?context=va&aid=12268

http://articles.cnn.com/2010-05-28/us/gulf.oil.environment.disaster_1_dead-zone-gulf-ecosystem-oil?_s=PM:US