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COPENHAGEN (AP) – President Barack Obama declared Friday a “meaningful and unprecedented breakthrough” had been reached among the U.S., China and three other countries on a global effort to curb climate change but said much work was still be needed to reach a legally binding treaty.

“It is going to be very hard, and it’s going to take some time,” he said near the conclusion of a 193-nation global warming summit. “We have come a long way, but we have much further to go.”

The president said there was a “fundamental deadlock in perspectives” between big, industrially developed countries like the United States and poorer, though sometimes large, developing nations. Still he said this week’s efforts “will help us begin to meet our responsibilities to leave our children and grandchildren a cleaner planet.”

The deal as described by Obama reflects some progress helping poor nations cope with climate change and getting China to disclose its actions to address the warming problem. But it falls far short of committing any nation to pollution reductions beyond a general acknowledgment that the effort should contain global temperatures along the lines agreed to at a conference of the leading economic nations last July.

The limited agreement by the U.S., China, Brazil, India and South Africa reflected the intense political and economic obstacles that had blocked a binding accord to restrict emissions of “greenhouse gases” believed to be causing a dangerous warming of the Earth.

The accord calls for the participating countries to list specific actions they have taken to control emissions and the commitments they are willing to make to achieve deeper reductions.

Obama said the five nation’s pledges would be “subject to an international consultation” that will allow each country to “show the world what they’re doing.”

The president had planned to spend only about nine hours in Copenhagen as the summit wrapped up after two weeks. But, as an agreement appeared within reach, he added extended his stay by more than six hours to attend a series of meetings aimed at brokering a deal.

It’s possible that Obama’s biggest success here will have nothing to do with the climate. He met with the Russian president and said afterward that the United States and Russia are “quite close” to a new nuclear arms control agreement to replace an expired Cold War-era arms control treaty.

The U.S. commitment to reduce greenhouse gasses mirrors legislation before Congress. It calls for 17 percent reduction in such pollution from 2005 levels by 2020 – the equivalent of 3 percent to 4 percent from the more commonly used baseline of 1990 levels. That is far less than the offers from the European Union, Japan and Russia.

Even that target was hard-won in a skittish Congress, and Obama has decided he can’t go further without potentially souring final passage of the bill, approved in the House but not yet considered in the Senate. He also could imperil eventual Senate ratification of any global treaty that emerges next year.