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WASHINGTON - Democrats took to the Senate floor Monday night to talk about global warming and planned not to let up until morning.

At least 28 senators were expected to participate in the dusk-to-dawn event, which was led off by the Senate majority leader, Harry Reid, Democrat of Nevada.

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Several Democrats who face tough reelection fights in the fall planned to skip it. Democratic leaders have no plans to bring a climate bill to the Senate floor this year, so the speeches were about little more than theatrics.

A climate bill led by then-Senator John Kerry of Massachusetts collapsed in 2010 without a vote in the Democratic-controlled Senate. House Democrats pushed through a bill to limit greenhouse gas emissions blamed for global warming in 2009, then lost their majority the following election.

Senator Brian Schatz of Hawaii, one of the organizers, said the all-night session showed that a growing number of senators are committed to working together to confront climate change.

Senator Sheldon Whitehouse, a Rhode Island Democrat, said the session was needed to highlight obstacles to climate legislation, including advertisements financed by Charles and David Koch, conservative activists who have spent $15 million on Senate races.

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