New York Times: White House officials have lauded President Xi Jinpings anticipated promise of a national market for China in greenhouse gas quotas as a breakthrough in environmental cooperation and reform. But to work well, Mr. Xis plan, expected to be announced in Washington on Friday, will demand big changes from a government accustomed to heavy-handed intervention and skewed statistics. It will take years of effort to build a substantial market that plays a major role in curbing emissions, and even then it...