Scores of world leaders, with varying climate records, have said they will be there. They include Brazilian President Luiz Inácio Lula da Silva, who has vowed to halt deforestation in the Amazon rainforest, and British Prime Minister Rishi Sunak, who recently delayed U.K. climate goals because of concerns about their costs.
The United Arab Emirates, a major oil producer, is hosting this year's summit, known as COP28. It comes as top scientists warn the world is far off track from meeting its climate goals.
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