In an extraordinary legal decision, five justices temporarily halted the Clean Power Plan, a cornerstone of Obama's climate strategy.
There's more than one reason the Democratic candidate has jumped on this issue.
But even if he made it to the White House, he wouldn't actually be able to stop most of it.
The Democratic presidential hopeful takes Hillary to task on climate change.
Michigan's governor has borne the brunt of the blame, but there's plenty to go around.
The president intends to change the way coal is managed on public lands, but it'll be up to his successor to carry the reforms through.
Limiting warming to 1.5 or 2 degrees C may be an empty gesture if countries can't be held accountable.
The deal in the works won't keep warming below 2 degrees C, but it could make a big difference anyway.
ExxonMobil spilled some 200,000 gallons of oil in Mayflower, Ark. But don't be too harsh on the company, says Rep. Markwayne Mullin.