Xinhua: The world expects the United States to take the lead in combating climate change, a French representative said on Thursday. The world was waiting for the United States to take the next step in curbing climate change, said Brice Lahonde, French special ambassador for climate change. The EU, along with other developed countries, has agreed to mandatory emission reductions, and the United States should follow suit, Lahonde said at the conclusion of the Major Economies Meeting on …