“If feeble man can do [so] much by his powers of artificial selection,” there was, Darwin speculated, “no limit to the amount of change” that could be effected by “nature’s power of selection.” A century and a half after On the Origin of Species, Darwin’s argument-by-analogy is still compelling, though every year it gets harder to keep the terms straight. “Feeble man” is changing the climate, and this is exerting strong selective pressure. So are myriad other forms of “global change”: deforestation, habitat fragmentation, introduced predators, introduced pathogens, light pollution, air
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