How are humans affecting the balance of the carbon cycle?

Since the onset of the industrial revolution about 150 years ago, human activities such as the burning of fossil fuelsand deforestation have accelerated, and both have contributed to a long-term rise in atmospheric carbon dioxide (CO2).

Burning oil and coal releases long hidden carbon into the atmosphere far more rapidly than it is being removed, and this imbalance causes atmospheric carbon dioxide concentrations to increase.

In addition, by clearing forests, we reduce the ability of photosynthesis to remove CO2 from the atmosphere, also resulting in a net increase.

Because of these human activities, atmospheric carbon dioxide concentrations are higher today than they have been over the last half-million years or longer.

Carbon is also found in the gas we breathe out, carbon dioxide (CO2).

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