President-elect Donald Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE’s energy agenda is shaping up to be a years-long effort to undo President Obama’s policies.

Supporters of Trump and industries that have opposed Obama’s regulatory actions say turning back the clock is the most important thing the president-elect can do to help businesses succeed.

But it won’t be easy to undo many of the energy and climate regulations that Obama has put in place.

Under federal law, reversing major regulations requires a time-consuming process that can drag on for months and sometimes years. And even after new rules are issued, they can be challenged in court — something environmental groups are already vowing to do.

The Obama administration, meanwhile, has in recent weeks added to Trump’s list of targets by issuing a new coal-mining regulation and offshore drilling bans in the Arctic and Atlantic oceans.

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Obama also created controversial national monuments in Utah and Nevada that Republicans are pushing Trump to repeal, something Obama says is not in Trump’s power to do.

“Some actions they will be able to do in relatively short order. Other major rules will take time to meet the burden of regulatory process,” said Scott Segal, a lobbyist at Bracewell who represents numerous energy companies.

“The next administration needs to be careful, transparent and follow the rule of law, or else they’ll have potential trouble in front of a reviewing court,” Segal said. “Because there’s no doubt that the environmental community would sue to prevent these actions.”

Still, much of Obama’s environmental agenda was enacted through executive actions, which are within Trump’s power to quickly reverse.

The Republican Congress can also help undo some of Obama’s recent rules by using the Congressional Review Act, which provides for the expedited repeal of regulations.

“The Obama administration has done a lot unilaterally, and the silver lining of that is that it can be undone unilaterally,” said Nick Loris, an economist at the conservative Heritage Foundation.

What seems clear is that Trump is dedicated to the fight.

While Trump has given a few nods to the green movement — Trump met separately with climate activists Al Gore Albert (Al) Arnold GoreFox's Napolitano: 2000 election will look like 'child's play' compared to 2020 legal battles Who calls an election? Why we need patience and nonpartisanship this time Universal mail-in voting jeopardizes the equal right to vote, but absentee voting protects it MORE and Leonardo DiCaprio after the election — his Cabinet picks are vocal critics of Obama’s agenda.

Trump’s selections include Oklahoma Attorney General Scott Pruitt (R) to lead the Environmental Protection Agency, Montana Rep. Ryan Zinke (R) to lead the Interior Department and former Texas Gov. Rick Perry (R) to lead the Energy Department.

William Yeatman, a senior fellow at the conservative Competitive Enterprise Institute, said an aggressive fight against Obama’s policies is a welcome change and something to be expected when the White House changes hands.

“It is not uncommon whenever there’s a change of party, given how much policy emanates from the executive branch these days, for recension to be of the order for the incoming president,” he said. “When policy emanates from the executive, and there’s a change in the executive, policy is supposed to reflect that.”

During the campaign, Trump ran in part on an aggressive deregulatory plan, saying in September that he would pursue “the elimination of all unnecessary regulations and a temporary moratorium on new regulations not compelled by Congress or public safety.”

Trump has specifically pledged to undo the Clean Power Plan, the Waters of the United States rule, Interior’s stream protection rule and the moratorium on new coal-mining leases on federal land.

He’s also promised to stop all payments to international climate efforts, to pull the United States out of the Paris climate agreement, and to open more federal land and water to oil and natural gas drilling.

The Trump transition website promises that the next administration “will unleash an energy revolution that will transform us into a net energy exporter, leading to the creation of millions of new jobs, while protecting the country’s most valuable resources — our clean air, clean water, and natural habitats.”

Environmentalists and other Trump opponents say many of Obama's actions are popular with the public and should be preserved. They accuse the Republican of focusing solely on reversing Obama, rather than putting forward energy and environmental plans of his own.

“If President-elect Trump decides to go in the direction that it appears he is, trying to undermine a full range of environmental protections, weakening or eliminating a move to a clean-energy economy, there will be a very strong reaction,” said David Goldston, director of government affairs at the Natural Resources Defense Council.

Goldston compared Trump’s plans to those of presidents George W. Bush and Ronald Reagan, as well as that of former Speaker Newt Gingrich (R-Ga.). All three came to power with broad deregulatory promises but failed to overcome opposition, he said.

“There was a strong vocal backlash, and they eventually decided this was not worth their effort. And we expect that to be the case again,” he said.

James Goodwin, a senior policy analyst at the Center for Progressive Reform, said he is optimistic that the country will continue to move toward clean energy sources like wind and solar, no matter what Trump does.

“There’s only so much you can do with policy that’s going to change the way we’re headed,” he said.