The logic is pretty straightforward. Carbon dioxide emissions are threatening the planet. In the U.S., coal plants are the second-largest source of those emissions, after transportation. Therefore, the Environmental Protection Agency should impose emissions limits on coal-fired plants.
The EPA is trying to do just that; it plans to issue rules by next June that would limit carbon dioxide emissions from existing power plants. As part of that process, it has just finished an 11-city “listening tour,” seeking public comment for how best to approach its task.