CNNMoney | Oil prices have plunged nearly 20% this month CNNMoney China's crashing stock market and the meltdown in the metals market may be getting all the attention lately, but crude oil is quietly crumbling once again. Oil has plunged nearly 20% this month alone and it briefly dipped below $47 a barrel on Tuesday. Oil Prices Turn Positive Oil market is in the dreaded 'double dip' so brace for more losses to come Oil slides to lowest level in four months |