Xinhua: The European Union (EU) and the United States pledged here on Sunday to cooperate more in fighting climate change. “The EU and the U.S. must also work together on helping developing countries reach their own goals in terms of reducing emissions,” the joint declaration issued by the EU-U.S. summit said. “Together, the EU and the U.S. will be in a stronger position to get on board key international actors and emerging countries and achieve an ambitious outcome at the UN …