12 April 2011 Updated at 13:10 ET
Shale gas 'worse than coal' for climate
Richard Black
Environment correspondent, BBC News
Gas is a natural by-product of shale rock
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The new kid on the energy block, shale gas, may be worse in climate change terms than coal, a study concludes
link-
http://www.bbc.co.uk/news/science-environment-13053040