(AP) U.S. delegate Jonathan Pershing told a climate conference in Bonn, Germany, Washington is not backing away from President Barack Obama's pledge to cut emissions 17 percent from 2005 levels despite the collapse of efforts to legislate a climate bill.

Pershing said legislation is the preferred way to control greenhouse gases, but the administration "will use all the tools available" to reach its target.

Obama made the pledge at a climate summit in Copenhagen last December, and affirmed it in a formal note to the U.N. climate secretariat. At the time, the U.S. House of Representatives had passed a climate bill and the Senate had been broadly expected to follow suit.

But the withdrawal of a scaled down climate bill last week in the Senate raised concern about America's commitment to fight global warming and disappointed developing countries that had hoped Obama would seize international leadership on the issue.

The European Union said the failure of the bill encumbered its talks among its own 27 member states on whether the EU should increase its pledge to rein in the gases blamed for global warming.

"It hasn't made the discussion and the debate any easier in Europe," Artur Runge-Metzger, the European Commissioner for climate change.

The EU has promised to cut emissions by 20 percent below 1990 over the next decade, but said it would raise its target to 30 percent if the U.S. and other major polluters adopt similarly tough goals.

Delegations from 178 countries began five days of work Monday, resuming painstaking discussions on an agreement to limit global emissions and prepare poor countries for the effects of a warming world.

Source: Associated Press