National Geographic: Ancient climate change cornered the woolly mammoth into a shrinking habitat, but humans delivered the final blow by hunting the species into extinction, a new study suggests. Climate change and hunting have long been blamed for forcing the mammoth into decline at the end of the Pleistocene era about 10,000 years ago. The last mammoth died out 4,000 years ago, experts estimate. But this study marks the first time that the massive, shaggy-haired animal’s demise has been explained …