The second night of Democratic presidential primary debates largely steered clear of climate change, drawing pushback from some green groups that had hoped to see the issue take center stage.

The topic saw roughly seven minutes of airtime during the two-hour debate.

The length of time devoted to the debates angered climate activists who have for months been calling for a debate devoted entirely to the issue.

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“Another debate, another climate section the length of a bathroom break,” tweeted the Sunrise Moevement, a youth advocate-driven group focused on climate issues.

“By not discussing climate nearly enough, this debate allowed candidates to hide behind vague promises of climate action,” Friends of the Earth tweeted after the debate.

Sunrise Movement and other environmental groups like the Sierra Club, along with candidates such as Washington Gov. Jay Inslee Jay Robert InsleeBarr asked prosecutors to explore charging Seattle mayor over protest zone: report Bottom line Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE, have called repeatedly for a debate devoted solely to climate change.

But the Democratic National Committee has rejected those calls, with chairman Tom Perez Thomas Edward PerezClinton’s top five vice presidential picks Government social programs: Triumph of hope over evidence Labor’s 'wasteful spending and mismanagement” at Workers’ Comp MORE saying, "It’s just not practical."

Inslee, a long shot presidential hopeful who appeared in the first round of debates on Wednesday, renewed his call for a climate-focused debate following Thursday's round.

"Fifteen minutes in four hours of debate is not enough time for candidates to put forward the bold plans needed to defeat climate change," he said in a statement.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE, Sens. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif) and Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) were asked to weigh in on their climate plans. South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE, former Colorado Gov. John Hickenlooper John HickenlooperThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cook Political Report shifts Colorado Senate race toward Democrat Willie Nelson playing at virtual fundraiser for Hickenlooper MORE, and author Marianne Williamson Marianne WilliamsonMarianne Williamson discusses speaking at People's Party Convention Fewer people watched opening night of Democratic convention compared to 2016 Marianne Williamson: Democratic convention 'like binge watching a Marriott commercial' MORE also offered their proposals surrounding the issue.

Harris, who referred to climate change as a crisis and reiterated her support for the Green New Deal, attacked President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE for his lack of leadership on the issue.

“The fact that we have a President of the United States who embraces science fiction over science fact will be to our collective peril,” she said.

Biden broke down some of the expenses of his $5 trillion climate plan, saying he would insist on installing 500,000 charging stations across the U.S. so that the nation could reach “a full electric vehicle future” by 2030. He added that he wants to invest $400 million in green energy research.

Hickenlooper stressed his past work with the oil and gas industry to reduce methane emissions, but cautioned against demonizing businesses.

“I think we’ve got to recognize that only by bringing people together, businesses and nonprofits — and we can’t demonize every business. We’ve got to bring them together to be part of this, too,” he said, otherwise, “we will be doomed to failure.”

Sanders, who has yet to release a climate plan for 2020, vowed to transition the U.S. away from fossil fuels to sustainable energy, saying the U.S should spend more money on sustainable energy sources than the military and foreign intervention.

“What the president of the United States should do is not deny the reality of climate change,” he said, adding “Instead of spending a trillion and a half [dollars] on weapons and destruction, let us get together for the common enemy.”