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Humans arent the only species to do these things. A black walnut tree poisons the earth around it to stymie competition. Grazers prevent forest growth. When photosynthetic life first emerged, the resulting surplus of oxygen nearly wiped out all life on the planet.

In these contexts, what we do to the planet is relatively insignificant. So long as we aren’t jettisoning carbon and organic material into the sun and energy is added to the system from space, life on earth will always be around.