NASA: Environmental disaster avoided on ozone loss

[Kadie]

NASA: Environmental disaster avoided on ozone loss

By SETH BORENSTEIN, AP Science Writer Seth Borenstein, Ap Science Writer – 22 mins ago

WASHINGTON – Here's rare good news about an environmental crisis: We dodged disaster with the ozone layer. A NASA study about ozone-munching chemicals from aerosol sprays and refrigeration used a computer model to play a game of what-if. What if the world 22 years ago didn't agree to cut back on chlorofluorocarbons which cause a seasonal ozone hole to form near the South Pole?

NASA atmospheric scientist Paul Newman said the answer is a "bizarre world."

By 2065, two-thirds of the protective ozone layer would have vanished and "the ozone hole covers the Earth." And the CFCs, which are long-lived potent greenhouse gases, would have pushed the world's temperature up an extra 4 degrees.

In mid-latitudes like Washington, DNA-damaging ultraviolet radiation would have increased more than sixfold. Just 5 minutes in the summer sunshine would have caused a sunburn, instead of 15. Typical midsummer UV levels, now around 10 or 11, would have soared to 30. Summer thunderstorms in the Northern Hemisphere would have been much stronger.

"It is a real horrible place," Newman told The Associated Press.

But that dreadful scenario was "a world avoided," according to the paper published this week in the journal Atmospheric Chemistry and Physics.


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