Democrats are facing a harsh reality check on the two-year anniversary of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's announced withdrawal from the Paris climate accord.

Despite passing historic climate legislation in the House this spring and states such as California stepping up to meet the emissions goals laid out in the Paris agreement, Democrats can’t effect change at the federal level with Republicans controlling the White House and the Senate.

And they've grown increasingly frustrated as Trump and GOP leaders have minimized the role of science and belittled calls for climate action.

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“There are a lot of Republicans who understand that climate denial will send their party into obsolescence, especially as the younger generation whose mind is completely made up about climate become more frequent voters,” Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) said on a call with reporters this week.

“Unfortunately none of those Republicans are named [Senate Majority Leader] Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE [R-Ky.],” he added.

House Democrats in May approved the Climate Action Now Act, the first climate-focused bill to pass the lower chamber in nearly a decade. The bill would bind the Trump administration to the agreements made under the Paris climate accord and direct Trump to figure out how to meet its emissions standards.

The same day, McConnell made it clear the bill’s future was bleak in the upper chamber, saying that “the ill-fated Paris deal will go nowhere here in the Senate.”

“Sen. McConnell has been wholly willing to back up the president’s assault on climate policy, and the handful of Republicans who are uncomfortable about it in the Senate are not yet willing to directly confront McConnell in order to force any of this legislation to the Senate floor,” Murphy said.

“Until Mitch McConnell gets real pressure from his caucus, which he isn't today, then nothing is going to change in the short run,” he added.

Some Senate Democrats are trying to raise that pressure.

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Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.) plans to introduce a companion bill when Congress returns next week, dismissing as "highly reckless" Trump’s decision, exactly two years ago on Saturday, to pull out of the accord.

“The President’s intention to withdraw the U.S. from the Paris Climate Agreement is highly reckless and unravels significant progress made to mitigate the effects of climate change,” Shaheen told The Hill in a statement.

“This legislation would help re-establish the United States’ commitment to combating climate change and reclaim our leadership on the world stage,” the statement said.

Sen. Tom Carper Thomas (Tom) Richard CarperThe conservative case for phasing out hydrofluorocarbons Democrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report MORE (D-Del.), ranking member of the Senate Environment and Public Works Committee and a co-sponsor of the bill, said the U.S. cannot afford to wait for Trump to come around on climate change.

“The reality is that we do not have time to wait for President Trump and other climate deniers to come to their senses, we must instead work now in Congress to realize the changes needed to protect our planet for generations to come,” Carper said in a statement to The Hill.

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.), sponsor of the House’s bill, said Republicans are failing to do their jobs or offer a solution of their own.

“The Senate should act as soon as possible. If Republicans refuse to hold a vote, they should offer a serious alternative for addressing our climate crisis,” she said in a statement Friday.

Even if Republicans were to introduce their own bill, it remains unclear whether Trump would sign it.

While Congress has struggled to attack the issue, local jurisdictions and individuals have made strides to tackle the Paris emissions promise on their own.

In the past two years, eight states have passed bills to bolster their own carbon reduction goals, according to the National Conference of State Legislatures, increasing the amount of energy that must come from clean or renewable sources.

Former California Gov. Jerry Brown (D) vowed to hold the state to the emissions standards set by the Paris accord. In the past year, California also became the second state to commit to reaching a 100 percent carbon neutral electric grid by a given year. Two other states have since followed suit.

But a Democratic president may be the only way to ensure environmental protections stand a chance in Washington, and the party’s White House hopefuls are pledging to support them. Former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE, 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 and former Texas Rep. Beto O’Rourke are among those who have released or plan to release policies to tackle climate change if they were to win the office.

Nearly all of the plans call for rejoining the Paris agreement on day one.

Green groups have also announced plans to put unprecedented resources into the 2020 race, including a goal of raising $1 million for the eventual Democratic nominee with a "Beat Trump Presidential Climate Unity Fund."

“Our focus now is on making sure that we build a political coalition in this country such that no one gets elected president of the United States again who isn't 100 percent committed to the issue of climate,” Murphy said.