As a science writer, I've been told repeatedly by ecologists that the population of a species increases to meet the available food supply -- but also, that any species that outstrips its resources goes extinct. We humans have stretched our own resource base by chemically force-feeding crops and mowing down forests to plant more. The unintended consequences are poisoned soil and waters, diminishing wildlife and an unsustainable population that grows by a million more people every four days. How, I ask, can we find a balance between what we need to survive and the health of the planet?
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