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The article originally appeared in Sierra on December 28, 2019. By Jason Mark Last fall, UC Berkeley hosted Half-Earth Day, a symposium to explore the idea of setting aside 50 percent of Earth’s lands and oceans for conserving biodiversity. The Half-Earth concept was conceived by E.O.

The theory of island biogeography, introduced by E.O. Wilson and colleagues in the 1960s, states that the crucial factor in the life and death of species is the amount of habitat available to them. As habitats are reduced in size, the diversity within them declines to a mathematically