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Human impacts on the environment are so great that we are at risk of changing the state of the planet from one that is hospitable to one that is hostile to humanity. Scientists have proposed nine Planetary Boundaries, global environmental limits within which the risk of changing the state of the planet is low, but already, four have been exceeded.

sustainable earth

The Planetary Accounting Framework: a novel, quota-based approach to understanding the impacts of any scale of human activity in the context of the Planetary Boundaries