AFP: The United States said on Wednesday that talks in China aimed at laying the foundations for a global climate change treaty had so far failed to make significant progress. Chief US negotiator Jonathan Pershing said time was fast running out to reach a set of agreements, which would then be submitted for approval at a major United Nations climate summit in Cancun, Mexico, next month. "There is less agreement than one might have hoped at this stage," Pershing told a small group of …