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the mantra protocol is a landmark

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international tree designed by all 198

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countries around the world in 1987.

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after we discovered that the emissions

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of the very long-lived gases such as

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chlorofluorocarbons can go into the

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atmosphere and destroy the autumn layer

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these countries around the world come

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together and find this

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protocol to reduce the emission of these

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my name is ching yang i am a research

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scientist working at nasa goddard space

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flight center

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due to the successful cooperation

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between the scientific community and the

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policy makers the atmospheric

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concentration has been declining since

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the 1990s

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and then the stratosphere ozone layer is

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on the road to recovery

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cs11 is one of the most important core

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for carbon gases the scientists around

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the world has always been continuously

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monitoring the atmospheric concentration

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of cfcs from the global observational

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stations

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a few years ago dr steve monska from

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noaa has noticed that the global

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concentration of cfc11 has actually been

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declining slower than expected that's

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inspired the community to think there

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might be

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additional emissions that we are not

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aware of

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scientists

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has also used the

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atmosphere observations of these gases

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from a korean station and find out that

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about half of the emission was coming

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from increasing emissions in eastern

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china

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so what i did was really taking my model

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get some background calculation and

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provide them to

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the

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university of bristol teams as well as

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the other modeling teams they use that

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as sort of the underlying atmospheric

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distribution of these gases

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as the problem was detected and these

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papers were published it seems that the

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chinese government has taken effective

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measures to stop the illegal production

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and usage of these gases

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it is absolutely detective work

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this is reason why we say although

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we are very happy with the progress of

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the multi-protocol it is of critical

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importance for nasa noaa along with

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other international agencies to continue

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to make atmosphere observations of these

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gases

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without these measurements it is not

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possible for us to detect the problem