In environmental news, humans have annihilated wildlife over the past half-century, threatening life on Earth as we know it. That’s according to a damning new report by WWF, the World Wildlife Fund. The report finds that human activity since 1970 is responsible for wiping out 60 percent of mammals, birds, fish and reptiles—with the remaining animals threatened by a degraded, over-exploited environment and the effects of climate change. This is Mike Barrett, executive director of science and conservation at WWF.

Mike Barrett: “What we need now is for heads of state to step up and take ownership of this problem and show real leadership. … Politically, 2020 is going to be an absolutely crucial year. It’s the point at which the world comes together to review its progress in starting to act on the Paris climate agreement, and we’re going to really need to ramp up our efforts if we’re going to avoid dangerous climate change across the world.”