Freya
2009-05-03 12:01:03
“Of the CO2 in the air, about 3 to 5% is the result of human activity.”
Not exactly. Of total annual CO2 emmissions, about 3% are human-caused emissions. But of the total, about 98% of it is absorbed by natural sinks, including growing plants, soil organic matter, and the oceans (for now). So, without human emissions or even with half the human emissions, all CO2 would be absorbed and there’s no net increase. With current human emissions, there is a net increase. Not much of one, but it has added up over time.
