Senate Democrats spent more than 14 hours talking about the importance of climate change Monday night through Tuesday morning.

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Sens. Brian Schatz (Hawaii), Sheldon WhitehouseSheldon WhitehouseThe Hill's Morning Report - Presented by the UAE Embassy in Washington, DC - COVID-19 fears surround Thanksgiving holiday Feinstein departure from top post sets stage for Judiciary fight Whitehouse says Democratic caucus will decide future of Judiciary Committee MORE (R.I.) and Barbara BoxerBarbara Levy BoxerBiden plays it cool as Trump refuses to concede The Hill's Morning Report - Presented by Facebook - Biden, Harris launch Trump offensive in first joint appearance Bottom line MORE (Calif.) led the charge and more than 20 other Democrats participated, including members of leadership, in the Senate’s 35th all-night session.

“Climate change deniers still exist,” Senate Majority Leader Harry ReidHarry Mason ReidFeinstein departure from top post sets stage for Judiciary fight Whitehouse says Democratic caucus will decide future of Judiciary Committee Bottom line MORE (D-Nev.) said at the beginning of the talkathon at 6:30 p.m. Monday. “They exist, I’m sorry to say, in this Congress. … Climate change exists and it’s time to stop denying it.”

Schatz and Whitehouse said Congress could reduce harmful effects of climate change if the United States relied less on fossil fuels.

“Climate change it real and climate change is caused by humans and climate change is solvable and we will not stop until Congress acts,” Schatz said.

Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellBiden's climate plans can cut emissions and also be good politics Acting Defense secretary makes surprise trip to Somalia As Biden administration ramps up, Trump legal effort drags on MORE (R-Ky.) said Democrats’ attack on fossil fuels was “cruel” to his constituents.

“Families are losing work because of government attacks on the coal industry. Communities are hurting and tonight you’re going to hear 30 hours of excuses from a group of people who think that’s OK,” McConnell said at the beginning of the evening. “Well it’s not OK. It’s cruel.”

McConnell has accused President Obama of waging a “war on coal” by ordering the Environmental Protection Agency (EPA) to regulate carbon emissions at coal power plants.

The Kentucky Republican, who is facing a difficult reelection race, also blasted billionaire environmentalist Tom Steyer, who plans to funnel a reported $10 million into crucial races that could make or break Democrats in their fight to retain the Senate majority.

Sen. James InhofeJames (Jim) Mountain InhofeHouse Democrats back slower timeline for changing Confederate base names Barrasso to seek top spot on Energy and Natural Resources Committee Overnight Defense: Trump orders troop drawdown in Afghanistan and Iraq | Key Republicans call Trump plan a 'mistake' MORE (R-Okla.), who has authored a book claiming that climate change was the “biggest hoax” ever perpetrated on mankind, said Democrats didn’t have the votes to pass major legislation that could affect climate change, such as a carbon tax, which was why the administration was implementing more regulations.

“I know they’ll enjoy staying up all night and they’ll have an audience of themselves,” Inhofe said. “It’s been virtually impossible to pass a cap and trade bill.”

Whitehouse has said he wants to make climate change a major issue in the 2014 election.

Notably, vulnerable Democrats such as Sens. Kay HaganKay Ruthven Hagan10 under-the-radar races to watch in November The Hill's Campaign Report: Democratic Unity Taskforce unveils party platform recommendations Democrats awash with cash in battle for Senate MORE (N.C.), Mary LandrieuMary Loretta LandrieuCassidy wins reelection in Louisiana Bottom line A decade of making a difference: Senate Caucus on Foster Youth MORE (La.), Mark BegichMark Peter BegichAlaska Senate race sees cash surge in final stretch Alaska group backing independent candidate appears linked to Democrats Sullivan wins Alaska Senate GOP primary MORE (Alaska) and Mark PryorMark Lunsford PryorCotton glides to reelection in Arkansas Live updates: Democrats fight to take control of the Senate Lobbying world MORE (Ark.) didn’t participate in the all-nighter.

-- This report was updated at 9:54 a.m.