One of the ways that we know that human activity is responsible for the CO2 increase is simply by looking at the historical records of human activities. Since the industrial revolution, we have been burning fossil fuels and clearing and burning forests at unprecedented levels, and the conversion process of organic carbon into CO2. The careful accounting of the amount of fossil fuel has been extracted and burned, and how much land clearing has occurred, shows that we have produced more CO2 than now remains in the atmosphere. The roughly 500 billion metric tons of carbon we've produced is enough to have grown up in the air's CO2 concentration to nearly 500 ppm. The concentration has not reached that level because the oceans and biosphere have the ability to absorb some of the CO2 we produce.* However, it is a fact that we produce CO2 faster than the ocean and Biosphere can absorb it explains the observed increase.
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