There were lots of news stories over the weekend previewing Wednesday's argument in Massachusetts v. EPA, as well as several editorials urging one outcome or another (see, e.g., here and here). One of the better stories was Joel Lang's coverage in the Hartford Courant.

For a basic rundown of the legal issues, one can consult this post by Justin Pidot on Grist. Pidot also authored this longer report surveying the whole field of climate-related litigation.

UPDATE: Lyle Denniston's preview on SCOTUSBlog is also well worth the read.

UPDATE: So, too, is this Dorf on Law post by Jamison Colburn.