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What Happened to the Hole in the Ozone Layer?

Season 51 | 3m 13s

The extreme thinning of the Ozone layer threatened to bring on a global crisis from destroying plants and ecosystems to sky-high skin cancer rates. So, what happened?

National Corporate funding for NOVA is provided by Viking Cruises. Major funding for NOVA is provided by the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.
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