By Gloria Dickie and Kate Abnett (Reuters) -Nearly 200 countries will gather next week for the U.N. climate summit, COP29. Reaching a consensus for a deal among so many can be difficult. Here are some of the major players and negotiating blocs involved in the COP29 summit starting Nov.

More than 40,000 people are expected to attend the global climate change summit as questions swirl about the United States' future involvement.

As COP29 aims to set a much higher climate financing target for the years ahead, wealthy nations insist the money cannot come entirely from their budgets.