When determining Earths carrying capacity for humans, why is it not enough to just consider human numbers?

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When determining Earth’s carrying capacity for humans, why is it not enough to just consider human numbers? What else must be considered?

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Environment

ISBN: 978-1118875827

9th edition

Authors: Peter H. Raven, David M. Hassenzahl, Mary Catherine Hager, Nancy Y. Gift, Linda R. Berg

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