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President Obama pledged on Tuesday to push for changes in how the federal government manages fossil fuel development on public lands, an emerging battleground in the nation's climate policies.

In the  of his presidency, he spoke at some length of the climate crisis, and derided those who deny the problem's severity. But his words were mostly a recitation of past accomplishments and familiar ambitions. There was no laundry list of bold programs and budding proposals this time.

But his call to "accelerate the transition away from dirty energy" did signal an emphasis on revamping hotly disputed programs, notably those for the leasing of coal reserves at low prices.

These are being challenged because they sustain the production of high-carbon fuels that scientists say must mainly be left in the ground in order to avoid the worst risks of global warming.

"That's why I'm going to push to change the way we manage our oil and coal reserves, so that they better reflect the costs they impose on taxpayers and our planet," he declared.

Although he offered no particulars, clean energy campaigners seized on the words as the latest sign that the administration wants to increase the price that mining companies pay for coal.

"It's time to not only reform our fossil fuel leasing program, we need to keep fossil fuels in the ground," said , president of Friends of the Earth, in a statement.

"The issue of fossil fuel extraction on public lands is going to be a key fight over the coming months," said , executive director of 350.org.

Because longstanding federal statutes call for a balancing act by federal land managers in how they develop and conserve the national patrimony of natural resources, Obama has considerable leeway in setting policies on leasing and similar management strategies. Environmental groups have already mounted a campaign in court to challenge rock-bottom prices charged for some fossil fuels. At a time when , there's a sharp argument over the economic repercussions of any changes.

Obama's speech sought to put this fight in the context of broad changes during his administration, and to depict them as mostly favorable economic developments.

"In fields from Iowa to Texas, wind power is now cheaper than dirtier, conventional power. On rooftops from Arizona to New York, solar is saving Americans tens of millions of dollars a year on their energy bills, and employs more Americans than coal —in jobs that pay better than average. We're taking steps to give homeowners the freedom to generate and store their own energy — something environmentalists and Tea Partiers have teamed up to support. Meanwhile, we've cut our imports of foreign oil by nearly sixty percent, and cut carbon pollution more than any other country on Earth," he said.

"Gas under two bucks a gallon ain't bad, either."

But cheap gasoline, appealing as it may sound to ordinary people, is troublesome both to those who want to keep on drilling and to those who would prefer to discourage profligate driving in newly affordable gas-guzzlers.

Similarly, when Obama boasted that in his two terms the nation has "reinvented our energy sector" he could be cheered both by solar advocates and fracking fans—but not lawmakers from coal states, who sat stolidly through his discussion of climate change.

Obama made sure there was no mixed message on the matter of climate science, though—the underpinning of his policy agenda.

"When the Russians beat us into space, we didn't deny Sputnik was up there," he said, in what was probably the night's most pointed barb.

"Look, if anybody still wants to dispute the science around climate change, have at it," he went on. "You'll be pretty lonely, because you'll be debating our military, most of America's business leaders, the majority of the American people, almost the entire scientific community, and 200 nations around the world who agree it's a problem and intend to solve it."

 is a Pulitzer prize-winning, nonprofit, non-partisan news organization that covers clean energy, carbon energy, nuclear energy and environmental science—plus the territory in between where law, policy and public opinion are shaped. Its mission is to produce clear, objective stories that give the public and decision-makers the information they need to navigate the heat and emotion of climate and energy debates.