Here are some more reactions and analyses of yesterday's oral argument in Massachusetts v. EPA:
Roger Pielke Jr. on Prometheus;
David Roberts on Grist;
GELPI's Justin Pidot on Grist;
Chris Mooney on The Intersection.
If that's not enough, Howard rounds up some of the news covereage here. I hope to post more of my own thoughts later today.
UPDATE: Here are some more: