Obama asks world to follow U.S. lead on climate change

UNITED NATIONS (AP) - In the first international test for his climate-change strategy, President Barack Obama pressed world leaders Tuesday to follow the United States' lead on the issue, even as a United Nations summit revealed the many obstacles that still stand in the way of wider agreements to reduce heat-trapping pollution.

"The United States has made ambitious investments in clean energy and ambitious reductions in our carbon emissions," Obama said. "Today I call on all countries to join us, not next year or the year after that, but right now. Because no nation can meet this global threat alone."

But none of the pledges made at Tuesday's one-day meeting was binding. The largest gathering of world leaders to discuss climate was designed to lay the groundwork for a new global climate-change treaty. It also revealed the sharp differences that divide countries on matters such as deforestation, carbon pollution and methane leaks from oil and gas production:

n Brazil, home to the Amazon rainforest, said it would not sign a pledge to halt deforestation by 2030.

n The United States decided not to join 73 countries in supporting a price on carbon, which Congress has indicated it would reject.

n And minutes after Obama said "nobody gets a pass," Chinese Vice Premier Zhang Gaoli insisted the world treat developing nations, including China, differently than developed nations, allowing them to release more heat-trapping pollution. China, the No. 1 carbon-polluting nation, signed on in support of pricing carbon and vowed to stop the rise of carbon-dioxide emissions as soon as possible.

"Today we must set the world on a new course," said United Nations Secretary-General Ban Ki-Moon, who added that pricing carbon was critical. "Climate change is the defining issue of our age. It is defining our present. Our response will define our future."