By Valerie Volcovici and Lisandra Paraguassu

BELEM, Brazil (Reuters) -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 scenes to ensure constructive talks.

Those were Washington’s roles, but they now reside with Beijing.

“Water flows to where there is space, and diplomacy often does the same,” Francesco La Camera, director general at the Intern

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