http://www.theguardian.com/environment/2014/apr/20/corn-biofuels-gasol
http://www.eenews.net/stories/105999814
http://www.salon.com/2014/04/21/worse_than_gasoline_new_study_delivers
http://switchboard.nrdc.org/blogs/fbeinecke/four_years_after_bp_oil_di
http://grist.org/politics/wanna-know-whats-happened-to-the-gulf-coast-
http://thinkprogress.org/climate/2014/04/20/3428269/bp-oil-spill-four-
http://www.post-gazette.com/news/world/2014/04/21/A-shale-oil-boom-bec