Gizmodo: Humans are pretty good at mucking up the Earth, whether were warming the climate, leveling the rainforest, or driving wild animals extinct. But climate change, at least, was wreaking havoc long before we got involved. For instance, its looking very likely that global warming, rather than human spears, doomed Earths wooly mammoths.
Theres a popular belief that Pleistocene hunters drove many of Earths megafauna to extinction some 11,000 years ago. But with recent improvements in the paleoclimate...