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NOVA: 49x1
Arctic Sinkholes
In the Arctic, enormous releases of methane, a potent greenhouse gas, threaten the climate.
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49 - 3Great Mammoth Mystery Feb. 16, 2022
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49 - 6Dinosaur Apocalypse: The New Evidence May. 11, 2022
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49 - 9Ice Age Footprints May. 25, 2022
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49 - 16Nazca Desert Mystery Nov. 02, 2022
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