Climate change is happening faster and in far more dramatically visible ways in Earth’s cryosphere than anywhere else on the planet. This includes the snow- and ice-dominated regions around the North and South Poles as well as high mountains ranges. Whether at high latitude or high altitude, temperatures in these regions have already warmed at least twice as fast as the global average. As a result, the ecosystems and communities in these fragile and beautiful places are disintegrating, in some cases right beneath our feet, as ice and ground (permafrost) melt away.