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Six months ago, US-backed Iraqi forces retook the city of Mosul from ISIS control. But the long battle obliterated the ancient city and claimed an untold number of civilian lives. Now its remaining residents are left to survive in the rubble.
Idlib was thought to be the last main refuge from war in Syria. But now, the province has become the government's newest target. Where do displaced civilians go when there's nowhere left to run?
Fly high above Manhattan with one of the NYPD's most elite teams: the Emergency Service Unit. See how they train for the unexpected--from chopper rescues to bridge climbing.
Travel to our planet's ground zero for climate change: Greenland. Explore the sublime landscapes of the Arctic and learn from scientists who are ringing alarm bells about ice melt.