At one point, permanently-frozen ground, or permafrost, covered nearly 1/4 of the land on Earth -- but that’s changing as global warming is melting the ice and changing the landscape in places like Siberia, Arctic Canada,...
At one point, permanently-frozen ground, or permafrost, covered nearly 1/4 of the land on Earth -- but that’s changing as global warming is melting the ice and changing the landscape in places like Siberia, Arctic Canada,...