This is difficult to say because while the Earth does have natural climatic cycles, the progressively worse effects of human activities on the atmosphere may cause permanent damage. Many believe that the damage we have caused to this point is irreversible, and despite widespread efforts to create a industry of lessening environmental impact, a more global industry may nullify these efforts. If the greenhouse effect becomes progressively worse and is in fact irreversible, the planet’s warming will also be irreversible.
Due to radiative forcing, the effects of extra carbon dioxide in our atmosphere will not be reversible for a long time. Even if we stopped adding carbon dioxide to our atmosphere today, temperatures would still rise a little more before they started falling. However, if we plant a bunch of trees and quit emitting so much carbon dioxide, we may see temperatures drop back down after a few thousand years.
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