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Chris Thomas writes that recent gains in species numbers associated with climate warming could more than balance species losses (Nature 502, 7; 2013). But conservation is not just about


total species richness — it is also about functioning ecosystems.


Unlike ecosystems that have resulted from millennia of competition and predation, we are much less sure about the stability of new, unfamiliar ones created by invasive species, which we know


can wreak havoc.


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