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Dale Hurst

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Even though levels of organic chlorine in the stratosphere are going down, we saw severe ozone depletion in the Arctic this past winter.

That effect will be with us for at least the first half of this century.

These fractions are surprisingly high. We would have expected them to be exhausted by 2003.

It's surprising that these chemicals are still being strongly emitted seven years after their production was banned.

The reservoirs of ozone-depleting chemicals found in old fridges and air-conditioning systems may be greater than anticipated, and if this continues into the future then the projection of ozone hole recovery in 2050 may have to be extended.

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