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 WhitehouseUnder pressure, Democrats cut back spending Equilibrium/Sustainability — Presented by Southern Company — Nations plan to pump oil despite net zero promises On The Money — It all comes down to Bernie and Joe MORE (R.I.) and Barbara BoxerBarbara Levy BoxerFirst senator formally endorses Bass in LA mayoral bid Bass receives endorsement from EMILY's List Bass gets mayoral endorsement from former California senator 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 ReidHarry Reid calls on Democrats to plow forward on immigration Democrats brace for tough election year in Nevada The Memo: Biden's horizon is clouded by doubt 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 McConnellGOP blocks Senate Democrats' revised elections bill A politicized Supreme Court? That was the point The Hill's Morning Report - Presented by Uber - Democrats optimistic after Biden meetings 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 InhofeOvernight Defense & National Security — Presented by Raytheon Technologies — Navy probe reveals disastrous ship fire response Sailors didn't know what to do in USS Bonhomme Richard fire, Navy probe finds Pentagon says almost half of Afghan evacuees at US bases are children 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 HaganInfighting grips Nevada Democrats ahead of midterms Democrats, GOP face crowded primaries as party leaders lose control Biden's gun control push poses danger for midterms 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 PryorBottom line Everybody wants Joe Manchin Cotton glides to reelection in Arkansas MORE (Ark.) didn’t participate in the all-nighter.

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