Lawmakers in both parties on Capitol Hill say there is no chance that the currently gridlocked Senate will ratify a climate change treaty in the near future, especially in a political environment where many Republican lawmakers remain skeptical of the established science of human-caused global warming.

“There’s a strong understanding of the difficulties of the U.S. situation, and a willingness to work with the U.S. to get out of this impasse,” said Laurence Tubiana, the French ambassador for climate change to the United Nations. “There is an implicit understanding that this not require ratification by the Senate.”

American negotiators are instead homing in on a hybrid agreement — a proposal to blend legally binding conditions from an existing 1992 treaty with new voluntary pledges. The mix would create a deal that would update the treaty, and thus, negotiators say, not require a new vote of ratification.

Countries would be legally required to enact domestic climate change policies — but would voluntarily pledge to specific levels of emissions cuts and to channel money to poor countries to help them adapt to climate change. Countries might then be legally obligated to report their progress toward meeting those pledges at meetings held to identify those nations that did not meet their cuts.

“There’s some legal and political magic to this,” said Jake Schmidt, an expert in global climate negotiations with the Natural Resources Defense Council, an advocacy group. “They’re trying to move this as far as possible without having to reach the 67-vote threshold” in the Senate.