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The Montreal Protocol is a
landmark international treaty

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signed by all 198 countries
around the world in 1987.

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After we discovered that the
emissions of the very long lived

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gases such as
chlorofluorocarbons can go into

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the atmosphere and destroy the
ozone layer, these countries

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around the world come together
and sign this protocol to reduce

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the emission of this long live
gases.

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My name is Qing Liang, I am a
research scientist working in

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NASA Goddard Space Flight
Center.

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Due to the successful
cooperation between the

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scientific community and the
policy makers, the atmospheric

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concentration has been declining
since the 1990s. And then the

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stratospheric ozone layer is on
the road to recovery.

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CFC 11 is one of the most
important chlorofluorocarbons

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gases, the scientists around the
world has always been

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continuously monitoring the
atmospheric concentration of

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CFCs from the global observation
of stations. A few years ago,

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Dr. Steve Montzka from NOAA ha
 noticed that the globa

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 concentration of CFC levels ha
 actually been declining slowe

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 than expected. That's inspire
 the community to think ther

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 might be additional emission
 that we're not aware of. Th

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 scientists has also used th
 atmospheric observations o

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 these gases from a Korea
 station and found out that abou

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 half of the emission was comin
 from increasing emissions i

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 eastern China

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So what I do is really taking my
model get some background

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calculation and provide them to
the University of Bristol teams

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as well as the other modeling
teams. They use that as the

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underlying atmospheric
distribution of these gases. As

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the problem was detected, and
these papers were published, it

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seems that the Chinese
government has taken effective

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measures to stop the illegal
production and usage of these

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gases. This is absolutely
detective work. This is reason

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why we say although we're very
happy with the progress of the

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Montreal Protocol it's of crit
cal importance for NASA, NOAA, a

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ong with other internati
nal agencies to continue to 

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ake atmospheric observation
 of these gases. Without t

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ese measurements, it is not poss
ble for us to detect the problem

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and take action to solve
the prob