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at which COP were countries first required to extend their commitment period​

Sagot :

Answer:

The Kyoto Protocol, a landmark environmental treaty that was adopted in 1997 at the COP 3 in Japan, represents the first time nations agreed to legally mandated, country-specific emissions reduction targets.

Explanation:

https://en.m.wikipedia.org/wiki/Kyoto_Protocol

the article where I got the info from, hope this helps