But,he said, now that he has returned, the United States is urging all those involved to show restraint.

VOA: standard.2009.09.22

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

But for now,he said, there is work to be done. "Every American affected by this spill should know this: Your government will do whatever it takes for as long as it takes to stop this crisis."

VOA: standard.2010.05.02