A U.S. Senate compromise bill aimed at battling global warming would cut emissions of greenhouse gases 17 percent by 2020, according to a summary given to senators and obtained by Reuters on Tuesday.

The legislation, being offered by Democratic Senator John Kerry and Independent Senator Joseph Lieberman, faces a tough battle for passage in the Senate this year — especially without a Republican sponsor.

Besides cutting carbon pollution, it contains incentives to expand U.S. nuclear power generation and offshore oil drilling. But in the wake of the huge, April 20 oil spill in the Gulf of Mexico, the proposal includes protections for coastal states that do not want oil drilling off their shores.