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Fracking increases dangerous earth burps

Al Jazeera: A study of derelict Pennsylvania oil and gas wells has spotted what is possibly a huge source of additional greenhouse gas emissions. Methane, which is pound-for-pound a much more potent climate-warming gas than carbon dioxide, could be leaking from hundreds of thousands of abandoned wells. And that’s just in the Keystone State. A growing body of evidence says countless old wells across the country -- most poorly monitored -- could be belching up the same dangerous emissions. The study by Mary...