Carbon sinks deep underground can capture and store emissions from gas flaring.

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Gas flaring (burning off natural gas released by oil drilling) in the delta produces 70 million metric tons of carbon emissions a year -- "a substantial proportion of worldwide greenhouse gas, " according to the World Bank.

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The flaring of natural gas, which often accompanies oil production, produces an array of air pollutants, and leaks and spills release toxins ranging from volatile chemicals, like benzene (a known carcinogen), to much heavier compounds, like benzopyrene (another known carcinogen).

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He also predicts that Petrobras will end up flaring much of the gas that rushes out with the oil, rather than spending lots of money to liquefy it to generate electricity.

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