After years of languishing far down the list of voters’ priorities, climate change has moved to the top of many voters’ concerns, according to a new CNN poll. Now Presidential candidates are competing to establish themselves as leaders on the issue, and children are making headlines for striking from school over the issue. Bill McKibben, whose book “The End of Nature” brought the idea of global warming to public consciousness thirty years ago, tells David Remnick that the accumulation of weather catastrophes—droughts, wildfires, floods—may have finally made an impact. “You watch as a California city literally called Paradise literally turns into hell inside half an hour,” McKibben reflects. “Once people have seen pictures like that, it’s no wonder we begin to see a real uptick in the response.” McKibben joined the New Yorker writer Elizabeth Kolbert in a conversation about the U.N.’s new report on biodiversity. It finds that a million species could become extinct within a few decades and that human life itself may be imperilled. Although the political tide could be turning, both worry that it is too late. “The problem with climate change is that it’s a timed test,” McKibben notes. “If you don’t solve it fast, then you don’t solve it. No one’s got a plan for refreezing the Arctic once it’s melted. . . . We’re not playing for stopping climate change. We’re playing—maybe—for being able to slow it down to the point where it doesn’t make civilizations impossible.”  And Karen Russell, whose books are inspired by her native Florida, finds a new sense of enchantment after relocating to the Oregon coast, where the big trees are like characters out of Jim Henson.