EPA’s GHG Rule: The Really Big Picture View

As some folks may have heard, EPA proposed emission guidelines for GHG emissions from existing generating units on Monday. Obviously, the rule is a little too complicated to summarize in one blog post, though I'll try to post on some aspects of it in coming days, if I can figure out a blog-efficient way to do so. Today, I'd like to focus on the big picture.

What do we know about EPA regulation of GHG?

• The Supreme Court has told EPA that greenhouse gases are, collectively, a pollutant under the Clean Air Act. That's a fact.
• EPA has not just the authority, but the obligation, to regulate emissions of GHG. That may be a truth not quite so universally acknowledged, but I think it's pretty clear.