More than a month has passed since the end of the twenty-first Conference of Parties (COP21) of the United Nations Framework Convention on Climate Change (UNFCCC).

The good news from last year’s COP21 meetings in Paris was a breath of fresh air. It was darkly ironic, though, that while President Xi Jinping delivered his visionary speech about what needs to be done, Beijing choked under a cloud of pollution. In contrast…