With the United States absent from the U.N. annual international climate summit for the first time in three decades, China is stepping into the limelight as a leader in the fight against global warming. Its country pavilion dominates the entrance hall of the sprawling COP30 conference grounds in Brazil's Amazon city of Belem, executives from its biggest clean energy companies are presenting their visions for a green future to large audiences in English, and its diplomats are working behind the