“Carbon removal looks a lot like renewables did like 25 years ago,” said Gregory Nemet, an environmental policy expert at the University of Wisconsin and one of the report’s co-authors. “Interesting technology: [It] could be really helpful for climate change, but [it’s] still small and not taken very seriously — in part because there wasn’t a lot of data about how much these technologies cost, how much we would need or how much there even was.”