Agence France-Presse: China will start cutting its carbon emissions by 2050, its top climate change policymaker was quoted as saying in the Financial Times Saturday, the first time the nation has given a timeframe. "China?s emissions will not continue to rise beyond 2050," said Su Wei, director general of the National Development and Reform Commission’s climate change department, according to the paper. China competes with the United States for the spot as the world’s top emitter of greenhouse gases …