Description: |
For the first time in centuries, the Arctic permafrost is beginning to change - rapidly. It's warming up. Some places are softening like a stick of butter left out on the kitchen counter. The consequences of this warming could have ripple effects around the world. Back in the 1960s, the Army dug a tunnel in Alaska so they could study the permafrost, which covers about a quarter of the Northern Hemisphere. Learn more about it in this news article. [Source: National Public Radio]
|
|