THOMPSONS, Tex. — Can one of the most promising — and troubled — technologies for fighting global warming survive during the administration of Donald J. Trump?

The technology, carbon capture, involves pulling carbon dioxide out of smokestacks and industrial processes before the climate-altering gas can make its way into the atmosphere. Mr. Trump’s denial of the overwhelming scientific evidence supporting climate change, a view shared by many of his cabinet nominees, might appear to doom any such environmental initiatives.

But the new Petra Nova plant about to start running here, about 30 miles southwest of Houston, is a bright spot for the technology’s supporters. It is being completed essentially on time and within its budget, unlike many previous such projects. When it fires up, the plant, which is attached to one of the power company NRG’s hulking coal-burning units, will draw 90 percent of the CO 2 from the emissions produced by 240 megawatts of generated power. That is a fraction of the roughly 3,700 megawatts produced at this gargantuan plant, the largest in the Lone Star State. Still, it is enough to capture 1.6 million tons of carbon dioxide each year — equivalent to the greenhouse gas produced by driving 3.5 billion miles, or the CO 2 from generating electricity for 214,338 homes.