John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE is adding his name to a growing list of Democratic presidential hopefuls rolling out climate action plans, with a $4 trillion proposal announced on Thursday.

The former Maryland congressman's plan focuses on six key areas to tackle the “climate crisis,” including an introduction of a carbon tax, renewable energy investments and funding carbon capture technology.

“We have to act on climate and we have to act now,” Delaney said in a statement. “We need a real plan to hit our goals and we have to listen to actual scientists. This is a real plan that all Americans can support. It is full of new ideas and massive investments in innovation that will both deal with climate change and create jobs in the heartland and all across our country.”

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He said the plan outlines initiatives he would achieve within the first 100 days of taking the presidency.

Delaney’s campaign called his commitment to a carbon tax, or fee, the largest component of his climate plan. He proposes starting the fee on carbon pollution at $15 per metric ton of Co2 and increasing the cost by $10 every year. The issue was an important one for Delaney while he was in Congress. He introduced the first bipartisan carbon fee and dividend bill in over 10 years, according to his campaign.

He said his plan would reduce carbon emissions by 90 percent by 2050.

Delaney is the fourth Democratic presidential candidate to release a comprehensive climate action plan, following 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, Colorado Sen. Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE and former Texas Rep. Beto O’Rourke, who announced a $5 trillion proposal.

Many of the party's 2020 candidates have also embraced climate change as a key issue to their campaigns.

Sens. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-NJ.) have both introduced policy plans that touch on curbing carbon emissions. Warren also last week called for a primary debate solely focused on climate change.

Sens. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) and Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.), meanwhile, have both pledged to refuse campaign donations from the fossil fuel industry and embraced the Green New Deal progressive climate plan.

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 is also working on his own climate plan, which is expected to have a more moderate focus.

South Bend, Ind. Mayor Pete Buttigieg Pete ButtigiegThe 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 Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE is the only other 2020 candidate to say he will aim for a carbon tax if elected. Last week, he laid out some policy positions that pointed towards supporting a tax on carbon.

A carbon tax has been a hot topic of late. On Wednesday, the CEOs of 75 major businesses, including Microsoft and BP, flooded Capitol Hill to preach the implementation of a federal carbon tax to lawmakers on both sides of the aisle.

The issue is largely considered a moot point with Republicans controlling the Senate and the White House.