Regarding burning materials like dried dung or wood does release carbon but does not contribute to increased atmospheric CO2 because the carbon in those materials have only recently become sequestered. Unlike fossil fuels in which the carbon has been sequestered for centuries. The recently sequestered carbon is part of the cycling of elements through the normal life-cycle of birth, growth, death, decay wherein elements are constantly bound up, released, and re-used. That's life and death in an ordinary way. Burning fossil fuels rapidly releases carbon that was bound up in a very long term way and overloads our system. Now, hypothetically, if we planted tropical rain forests at the same rate we burned fossil fuel, perhaps it would even out. I'm not smart enough to design a model to calculate that. someone is though, and maybe it has been calculated.
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