Specifically, the budget says the agency hopes to determine whether it should craft carbon-emissions standards for several big industrial pollution sources—notably refineries, but also pulp and paper facilities, iron and steel production, and few other categories.

But if the pledges about expanding climate rules sounds familiar to EPA-watchers, they should: The fiscal 2014 plan said the same thing about a decision on the rules, and the fact that the agency has now moved these decisions to its 2015 budget suggests that determinations in 2014 are probably not in the cards.

Now, with the clock winding down on the Obama administration, experts say it's unclear whether EPA will craft carbon-emissions standards for any big stationary pollution sources beyond power plants—or even if it has enough time or resources left to do so.

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