A mass restoration of ecosystems offers us hope where there was little hope before.
Until modern humans arrived, every continent except Antarctica possessed a megafauna. In the Americas, alongside mastodons, mammoths, four-tusked and spiral-tusked elephants, there was a beaver the size of a black bear: eight feet from nose to tail(1). There were giant bison weighing two tonnes, which carried horns seven feet across(2).
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