WASHINGTON — With a centerpiece of President Joe Biden’s climate change strategy all but dashed, Democratic lawmakers headed to the White House on Tuesday searching for new ways to narrow, reshape and swiftly wrap up negotiations on what had been his sweeping $3.5 trillion budget plan.

Nearly 20 centrist and progressive lawmakers met in separate groups with Biden as Democrats review a “menu” of alternative emission-reducing strategies — one of the most crucial issues for voters who support the president and his party — and race to reach accord on his overall package.

Among the climate-change-fighting proposals being considered are a tax on carbon dioxide emissions from fossil fuels such as oil and coal, a methane emissions fee and tax breaks for energy providers who hit certain emissions goals.

The Democrats need to find tactics that can be accepted by both centrists and moderates, whose votes are all needed in the evenly divided Senate. Senators want to reach a framework this week.

“Our goal is to continue to make progress,” White House press secretary Jen Psaki said.

Biden’s main climate-fighting plan seems all but dead. A key holdout, conservative Sen. Joe Manchin from coal-state West Virginia, has made it clear he is opposing the president’s proposal to have the government provide financial rewards to electric utilities that meet clean energy benchmarks and impose penalties on utilities that don’t, in line with the president’s goal of achieving 80% “clean electricity” by 2030.

The alternative strategies being compiled and assessed could align with Manchin’s stated goal of keeping a “fuel neutral” approach to federal policy that does not favor renewable energy sources over coal and natural gas that are dominant in his state — though the senator told reporters a carbon tax was not at all in the mix.

“Everybody’s talking,” Manchin said.

Biden wants to show progress on his entire package of expanded social services as well as climate change efforts, now being scaled back to about $2 trillion, by the time he departs next week for a global climate summit in Glasgow, Scotland. And he’s not alone.

“There was universal — universal — agreement in that room that we have to come to an agreement and we got to get it done,” Senate Majority Leader Chuck Schumer of New York said after a lengthy lunch at the Capitol that senators described as “lively” and “spirited.”

Tackling climate change has been a cornerstone of the president’s “Build Back Better” proposal, his sweeping plan to bolster federal government spending on health care, child care and other social services while addressing the climate crisis that Democratic voters say is one of their most important issues.

Advocates warn that inaction on climate change could cost the U.S. billions of dollars in weather-related disasters and threaten to uproot millions of Americans in hurricanes, wildfires, droughts and floods. Twice as many peopled died in the U.S. from natural disasters in the first nine months of this year as in 2020, according to the National Oceanic and Atmospheric Administration.

Without Manchin’s support, however, the Clean Energy Performance Plan — also called the Clean Energy Payment Plan — is almost certain to be eliminated from the package, lawmakers and aides say.

“I’ve been told it would be prudent to plan alternatives,” said Sen. Sheldon Whitehouse, D-R.I.

Instead, lawmakers are eyeing a package of tax changes from Sen. Ron Wyden, D-Ore., the chairman of the Finance Committee, who has argued that the bulk of greenhouse gas emission cuts would come from an energy tax overhaul he is spearheading.

Among tax changes his committee is considering are tax credits for energy producers that reduce emissions, and pollution fees to be paid by industries for every ton of planet-warming carbon dioxide they emit.

Psaki said that the administration has “multiple pathways” to meet Biden’s pledge to cut carbon emissions in half by 2030. For months, Manchin has publicly and repeatedly rejected the size and scale of Biden’s plan, and the senator has particularly objected to the green energy strategies.

He and other centrist lawmakers, including Sen. Kyrsten Sinema, D-Ariz., have forced Biden to concede that the final price tag will likely be much smaller, likely around $2 trillion — largely paid for with higher taxes on corporations and those earning over $400,000 per year.