(MONEY.CNN) — Big banks are cringing as crude oil is crumbling.
Firms on Wall Street helped bankroll America's energy boom, financing very expensive drilling projects that ended up flooding the world with oil.
Now that the oil glut has caused prices to crash below $30 a barrel, turmoil is rippling through the energy industry and souring many of those loans. Dozens of oil companies have gone bankrupt and the ones that haven't are feeling enough financial stress to slash spending and cut tens of thousands of jobs.
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