Swells of Siberian tundra roll north toward the Arctic Ocean; a reindeer herd grazes on a distant crest. It’s mid-July, and the group of Nenets herders that Yuri leads are about halfway through ...

Scientists warn that the Siberian tundra could disappear by the year 2500 if greenhouse gas emissions are not reduced. The melting of permafrost could pose serious problems for our planet. Researchers ...