Grist: The U.S. and China are in friction over plenty of topics cyber attacks, military jostling in the South China Sea, a recent currency devaluation but theyve found significant common ground on at least one issue. Chinese President Xi Jinpings first state visit to the U.S. resulted on Friday in a new joint presidential statement on climate change. It outlines Chinas plans for a nationwide cap-and-trade scheme for 2017, a new $3.1 billion commitment from China to climate finance for poorer nations,...