Study: We've wiped out half the world's wildlife since 1970

We're increasing our ability to affect our world, and have yet to realize what that means.

major recent survey by the World Wildlife Fund estimated that the number of mammals, birds, reptiles, amphibians, and fish worldwide has declined a whopping 52 percent between 1970 and 2010. The main culprits? Humans. Mainly through hunting, fishing, deforestation, pollution, and other forms of habitat destruction...