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US scientists call on the nation's Congress for more studies about the safety of hydraulic fracturing, a method to increase the extraction of natural gas by using dangerous chemicals that can contaminate drinking water and air and have been linked with fatal cancers and kidney failure.

http://www.telegraph.co.uk/finance/personalfinance/offshorefinance/8488166/Frack-and-ruin-the-rise-
of-hydraulic-fracturing.html,
http://www.nytimes.com/2011/05/07/science/earth/07frack.html

A study of migrating loggerhead turtles, led by graduate student Jared M. Ragland at the College of Charleston, in South Carolina, USA, finds significant blood levels of 67 different chemicals used in pesticides and other industrial products.

http://www.nytimes.com/2011/04/26/science/26obturtles.html?ref=science
http://9cores.com/6493/migrating-sea-turtles-pick-up-more-pollution.html