The news just keeps getting worse on this blowout-
Methane gas (natural gas) is what caused the explosion. Natural gas not only profoundly depletes oxygen in the ocean at this concentration, it is also a much stronger greenhouse gas than carbon dioxide. I have to wonder if a gas emission of this magnitude is a climate changer. Some alternative theories of global warming suggest that sudden oceanic emissions of methane are what really brought on abrupt global warming.
Gulf oil full of methane, adding new concerns. By Matthew Brown. Associated Press.