$200 bn in debt looms over American oil and gas — Tempted by big returns, shale companies have borrowed more than $200 billion in bonds and loans, from Wall Street and London, to cover development and projects that may not even come to fruition. Oil producers' debt since 2010 has increased more than 55 percent, and revenues have slowed, rising only 36 percent from September 2014, compared to 2010, according to the Wall Street Journal.

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