China is poised to take advantage of the global urgency to tackle climate change. It is the world’s dominant manufacturer and user of solar panels and wind turbines. It leads the world in producing energy from hydroelectric dams and is building more nuclear power plants than any other country. But China also burns more coal than the rest of the world combined and has accelerated mining and the construction of coal-fired power plants, driving up the country’s emissions of energy-related greenhouse gases nearly 6 percent last year, the fastest pace…