In the Arctic, a great change is taking place. Permafrost, which covers around 25 percent of exposed land in the Northern Hemisphere, is melting.
The Arctic is an “indicator region” for the rest of the planet: small changes there can have profound ecosystem impacts elsewhere in the world…
Dear EarthTalk: To what extent is Antarctica really melting and what impact might it have on coastlines around the world? — Andrea Hutchinson, Cary, NC The Antarctic continent, roughly the size of the United States and Mexico combined, is composed of rock covered by glaciers some 16,000 feet thick. The glaciers form from fallen snow compacting […]