It's happened: The EPA will set up a greenhouse gas registry for various contributors to our economy by late June 2009.

Reuters reports:

After a public comment period and public hearings, that could allow EPA to regulate it under the Clean Air Act. The Clean Air Act mandates collecting data on emissions from electric power plants, but a 2007 congressional move to require big industries and the transportation sector to report on how much carbon they emit was blocked by the Bush administration.

The rules would apply to companies that make fossil fuels, industrial chemicals, cars and engines, the agency said, along with large so-called direct emitters that send 25,000 metric tons of carbon dioxide or more each year into the atmosphere.