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“Despite Europe’s desire to loosen its reliance on Russian gas, the shale revolution has turned out to be a dud. Difficult geological conditions, fierce environmental opposition, cumbersome regulations and a bloody war in Ukraine have conspired to quash investors’ enthusiasm and wear down their patience. The collapse of oil prices to less than $50 a barrel in March was the final straw because the cost of much of Europe’s gas, including Russian imports, is linked to crude.” 
 
Bloomberg News 5-12-15