But he says the United States can't solve the world's problems alone and it is time for all U.N.

VOA: standard.2009.09.23

The U.N.climate change talks opened Monday with warnings that time was running out on reaching a deal.

VOA: standard.2009.09.28

Mr.Obama urged Tehran to agree to a U.N.proposal to ship its uranium abroad for processing, adding that time for diplomacy on the issue is running out.

VOA: standard.2009.11.16

Thetop U.N.climate official Yvo de Boer said it is time to act.

VOA: standard.2009.12.06

Yvo de Boer,the U.N.'s top climate change official, told delegates there was still time to break deadlocks, but he said countries that could be more ambitious should act now.

VOA: standard.2009.09.28