Question

consequences for other species of our appropriation of photosynthate.

Answer 1

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We examined human impact on the biosphere by calculating the fraction of net primary production (NPP) that humans have appropriated. NPP is the amount of energy left after subtracting the respiration of primary producers (mostly plants) from the total amount of energy (mostly solar) that is fixed biologically. NPP provides the basis for maintenance, growth, and reproduction of all heterotrophs (consumers and decomposers); it is the total food resource on Earth. We are interested in human use of this resource both for what it implies for other species, which must use the leftovers, and for what it could imply about limits to the number of people the earth can support.

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