House Democrats on Wednesday unveiled long-awaited legislation designed to reduce carbon emissions and take on climate change by binding the United States to commitments made under the Obama-era Paris climate accord.

Speaker Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) joined other Democrats in releasing the legislative package in the Capitol, framing climate change as "an existential threat" and promising that the party will move the legislation quickly to the floor.

“The American people know that the … crisis is an existential threat of our generation, of our time, a crisis manifested in natural disasters of epic proportions,” she said.

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The five-page bill known as the Climate Action Now Act aims to block President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE from pulling out of the Paris climate agreement reached by the U.S. and other world powers in 2015 under former President Obama. Under the bill, Trump would also have to submit a new plan to Congress outlining how the U.S. will continue to meet the goals established in the Paris agreement.

Trump has said the accord threatens the economic prosperity of industries in the U.S. and that he intends to withdraw from the agreement in November 2020 — the earliest he’s legally permitted to do so.

Since taking office, Trump has allowed his administration to circumvent the carbon-cutting goals laid out by the agreement.

The Democrats’ bill comes from Rep. Kathy Castor Katherine (Kathy) Anne CastorOVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium Trump courts Florida voters with moratorium on offshore drilling Lawmakers, public bid farewell to John Lewis MORE (D-Fla.), chairwoman of the House Select Committee on the Climate Crisis, a panel that Pelosi created at the start of the year following calls from progressives for a more concerted effort in the Democratic-led House to tackle climate change.

The issue has created some territorial tensions within the party, as leaders of the committees with jurisdiction over climate initiatives have fought to maintain their authority over how Democrats proceed. The tensions forced Pelosi to balance those concerns with those of advocacy groups pressing for a more aggressive approach to environmental protection. She did so by creating the special committee, without giving it the ability to issue subpoenas like other panels.

Castor on Wednesday said tackling climate change is “a moral obligation” facing Congress, framing the new legislation as just the first step of a much broader Democratic effort to address the global crisis.

The bill will be marked up in the various committees of jurisdiction “over the coming weeks,” Castor said, and come to the floor afterward.

The rollout of the bill comes a day after Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) brought a vote on another climate bill — the Green New Deal — which was designed to put Democrats on the record on legislation lobbied by progressives that’s emerging as a litmus test for 2020 presidential candidates.

Democratic leaders called it a “sham” vote, noting the absence of hearings on the legislation. And Senate Democrats sought to defuse any controversy surrounding the bill by largely voting present on the floor.

The Green New Deal resolution, which many Democrats view as aspirational, at best, largely aims to jump-start U.S. economic growth by transitioning the country’s electric grid to 100 percent renewable energy by 2030.

Pelosi has long declined to say whether she intends to bring a vote on the House’s version of the Green New Deal resolution, championed by freshman Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezHouse passes bill to avert shutdown Trump attacks Omar for criticizing US: 'How did you do where you came from?' The Memo: Dems face balancing act on SCOTUS fight MORE (D-N.Y.).

Following a call by House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy's Democratic challenger to launch first TV ad highlighting Air Force service as single mother Trump asked Chamber of Commerce to reconsider Democratic endorsements: report The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill MORE (R-Calif.) in early March to hold a hearing on the resolution, Pelosi promised there would be debate on some climate bill, but didn’t say which one.

Ocasio-Cortez herself has not made calls for her resolution to be marked up or brought to the floor. Instead her office is working on new piecemeal bills that would address specific policies laid out in the broader plan. Those bills aren’t expected until early next year, her staff told The Hill.

The climate fight has been decidedly partisan. And the Democrats on Wednesday were quick to bash Trump's intent to leave the Paris climate accord, which he announced as president in 2017.

Rep. Eddie Bernice Johnson Eddie Bernice JohnsonHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll House passes legislation to boost election security research Hillicon Valley: Twitter flags Trump campaign tweet of Biden clip as manipulated media | Democrats demand in-person election security briefings resume | Proposed rules to protect power grid raise concerns MORE (D-Texas), chairwoman of the House Science, Space and Technology Committee, said Trump's decision to withdraw from that agreement "is both misguided and ill-advised."

"Rather than pretend that the human-induced climate change doesn't exist, we need to do all that we can to work to meet the goals of the Paris agreement," she said.

The select committee on climate change boasts a number of young freshman members, who used Wednesday's rollout to argue the importance of preserving the environment for the health of future generations.

Rep. Mike Levin (D-Calif.), a 40-year-old former environmental activist, said Congress must "embrace the scientific consensus" that climate change "is driven by human activity" — and inaction by American policymakers "would be catastrophic."

Rep. Joseph Neguse (D), a 34-year-old representing Boulder, Colo., warned that Congress has "a very short runway to avoid very catastrophic consequences for our planet."

And Rep. Sean Casten Sean CastenThe Hill's Campaign Report: Buzz builds around Warren for VP Gun control group rolls out House endorsements Human Rights Campaign rolls out congressional endorsements on Equality Act anniversary MORE (Ill.), a 47-year old former clean energy executive, accused Trump and Republicans of "ignoring the single most serious threat to the existence of human life on earth."

"From Normandy to the Cold War, American leadership has been about identifying long-term existential threats to the entire population, and then leading the rest of the world to mobilize around a shared set of goals and values," he said.

"That's what we need."