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Question: there are roughly 720 billion metric tons of carbon in...

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There are roughly 720 billion metric tons of carbon in the atmosphere. An even bigger carbon sink is found in the oceans, which contain about 40 trillion metric tons. Human activities increase the amount of carbon stored in these reservoirs. The primary source of this increase is the combustion of fossil fuels, which generates about 6 billion metric tons of carbon per year. Deforestation adds an additional 2 billion metric tons annually. Whereas 25% of this flux ends up being absorbed by the oceans and another 25% is absorbed by plants, 50% stays in the atmosphere for the duration of its residence time.

How much carbon will human activities add to the atmosphere over the course of five years?

which one is the correct answer ?

8 billion metric tons

10 billion metric tons

20 billion metric tons

40 billion metric tons which one is the correct answer ?

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