China dominates the worldwide markets for solar panels, electric vehicles, and batteries able to store energy when the sun or wind is down. If the U.S. does not support domestic renewable-energy industries, China’s dominance will only grow, with the European Union and India poised to also rise. If the Trump administration stops federal support for renewables or, worse, discourages them, the nation will both continue to degrade its environment and miss a profound economic opportunity. “This is ceding the future,” says Steven Cohen, director of Columbia University’s master’s program in sustainability management.