Most Shared Stories Tagged: United States

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Melting Permafrost

For today's Geo Quiz, we head to the frozen north. We have heard a lot about the problem of melting ice as climate change warms up the Arctic. But scientists are also worried about something else that is melting up there — permafrost.

Harvesting water from rooftops

The World's Jason Margolis reports that in many parts of the globe where water is scarce, people are boosting their supply by harvesting rainwater from their rooftops