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Cooperation between the United States and China on global warming has been dealt a major blow after China’s foreign ministry suspended climate talks with the United States. The decision came in response to last week’s high-profile trip to Taiwan by Nancy Pelosi, US speaker of the US House of Representatives, which China says violated its sovereignty. Researchers say a temporary freeze in discussions will probably affect only high-level political engagements, but that a longer stand-off could have a chilling effect on academic collaborations.