The protocol was opened to other countries. Signed as the country party in the 16 September 1987 and enforcement since the day 1 January.1989 onwards, since then, has amended protocol 5 times together, for the first time at London, United Kingdom, when the 1990, twice. At Copenhagen, Denmark, when, in 1992The third at the Vienna, Austria. When BC, 1995 four times at the town common ทรีออล Canada when the 1997. And the five at Beijing, China in 1990.1999 because there are used widely and the support from other countries, and many other notable The enterprise make the Montreal protocol was regarded as an example of international cooperation in solving international.
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