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Humans currently release a little over 40 billion tons of CO2 into the atmosphere each year, most of which (over 30 billion tons) comes from burning fossil fuel.

This is roughly equal to the excess biomass decay of the northern hemisphere over that of the Southern Hemisphere in one seasons. The overall biomass decay remains fairly constant, and does NOT contribute excess CO2 into the atmosphere, with the exception of tropical deforestation and some wild fires.

The reason temperate deforestation does not contribute to increased CO2 emission is that much of that wood is converted into lumber, subsequently sequestered in homes, buildings, furniture. Tropical forest, in contrast, is slashed and burned.

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