After the 2010 Deepwater Horizon disaster, BP applied 1.84 million gallons of Corexit dispersant. A peer-reviewed study found crude oil becomes 52 times more toxic when combined with Corexit. The dispersant served a PR purpose: making the oil invisible on TV screens while actually increasing toxicity. BP rebuffed EPA Administrator Lisa Jackson's request to use a less toxic alternative — and Jackson couldn't legally require it. Corexit suppressed natural oil-degrading bacteria and caused devastating long-term health effects in cleanup workers.