Xie Zhenhua, vice-chairman of the powerful National Development and Reform Commission, also warned the United States it should not use domestic divisions over climate change as an excuse to pass its responsibilities off onto other countries. Influences on changes in the Earth's climate includes cycles in solar activity — traditionally measured by sunspots — but that is far outweighed by recent increases in greenhouse gas emissions, most scientists say. But the Intergovernmental Panel on Climate Change (IPCC) has stood by its main 2007 finding — that it was more than 90 percent certain that human activities were the main cause of global warming in the past 50 years. But despite Xie's unusually sceptical comments, he made it clear that Beijing has no intention of rowing back from ambitious commitments to greener growth that it sees as vital to energy security and growth as well as tackling warming. President Barack Obama recently also urged his country to embrace a push towards cleaner energy, and said climate sceptics should see past their doubts about the causes of warming to the benefits of green technology. China's top climate negotiator said on Wednesday that the cause of global warming was still not clear but the problems it was creating were so serious that the world must anyway act to cut greenhouse gas emissions. read more
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