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.

World leaders are being called on to commit to a fast, fair and funded phase-out of fossil fuels ahead of COP29.