State methane gas

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Methane gas (CH4) comprises 7 x 10-5 % by mass of the Earth's atmosphere. What is the residence time of the gas in the atmosphere if it is being lost to the methane sinks at the rate of 4 x 1011 kg yr-1.
Estimated mass of the Earth's atmosphere = 5 x 1018 kg.

Reference no: EM13165584

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