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190 countries
UNFCCC member countries are involved in it. There are total 63 countries.
The Copenhagen Summit was from December 7th to December 18th, 2009.
The purpose of the Copenhagen Climate Council is to create global awareness of the importance of the Un Climate Summit in Copenhagen, December 2009.
According to the official COP15 website 193 countries (and numerous NGOs) participated, so the answer to your questions must be Participating FOREIGN countries.
The 2009 United Nations Climate Change Conference, commonly known as the Copenhagen Summit, was held at the Bella Center in Copenhagen, located on the island of Amager, Denmark. (Wikipedia)
The summit was officially chaired by the Danish Prime minister (who by most accounts did quite a poor job)
44 countries participated in the 1924 Summer Olympics. 16 countries participated in the 1924 Winter Olympics.
There are no counties in Copenhagen. It is one big muncipality.
71 countries participated at the 2010 Commonwealth Games.
It was practically all countries as the number of participating states was 193. As of Jan 10, 2010, only 28 states have, however, signed the resulting Copenhagen accord. The process of getting more to sign in ongoing.
44 countries participated in the 1924 Summer Olympics. 16 countries participated in the 1924 Winter Olympics.