THE amount of greenhouse gases released by unconventional gas drilling ''exceeds that of oil or coal'', an American study says in contradiction of some claims made by Australia's growing coal-seam gas industry. Cornell University researchers analysed the volume of methane leaking from shale-gas wells in the US and concluded that using more gas would make climate change worse, rather than better. The credibility of the study, to be published in the peer-reviewed Climatic Change, has been questioned by some American researchers and the Australian Petroleum Production and Exploration Association (APPEA),...
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