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Warmest temperatures ever recorded and the second lowest sea levels. greenland is ground zero for these radical changes. and that is why nasa's operation ice bridge is up here. its mission is to map earth's polar ice and understand its connection to the global climate. cruising altitude on operation ice bridge is 1,500 feet. perfect for an extraordinary view of our climate's changing in realtime. >> on average, we now know that the greenland ice sheet is losing nearly 300 gig tons of ice per year. and that works out to thousands of tons of ice being lost from this ice sheet per second. >> wait...

Climate. cruising altitude on operation ice bridge is 1,500 feet. perfect for an extraordinary view of our climate's changing in realtime. >> on average, we now know that the greenland ice sheet is losing nearly 300 gig tons of ice per year. and that works out to thousands of tons of ice being lost from this ice sheet per second. >> wait a minute, you just said thousands of tons of ice are lost per second. >> exactly. that works out to a new subdivision worth of homes of ice being lost every second. >> reporter: joe mcgregor is the mission's deputy project scientist. to collect this data and c...