President Donald Trump signed a sweeping executive order last week rescinding numerous federal climate policies and calling for the review and replacement of the Obama administration’s most ambitious effort to control climate pollution — the Clean Power Plan.

The order is Trump’s most aggressive move yet to dismantle federal climate regulations even as established climate science shows that man-made global warming is a growing threat to human life and the economy.

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In all, Trump’s executive order targets at least 23 federal rules, regulations, executive orders, memorandums and reports related to energy and climate change, many of which are likely to be tied up in years of legal wrangling before being decided. The total number is likely much higher because the order directs federal agencies to tally up all their rules and regulations that can be interpreted to “constrain” energy production and prepare them to be rescinded if they’re deemed to be a “burden” on energy production and use.

Legal experts and climate scientists say the move abdicates U.S. leadership on climate change and incentivizes nearly unfettered fossil fuels development across the country. Those steps could diminish the chances that countries can prevent the world from warming to levels that scientists consider dangerous — 2°C (3.6°F).

The order signed by Trump killed what is known as the Climate Action Plan. The plan was President Obama’s overarching roadmap for how the United States would cut its climate pollution and adapt for the effects of global warming.

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Even though cheap natural gas is the main cause of the coal industry’s troubles, Trump blamed the industry’s hard times on climate policy. His order asks the EPA to review the biggest part of Obama’s policy — the Clean Power Plan — and either revise or withdraw it.

The order calls for the U.S. attorney general to request that courts halt current court actions on the Clean Power Plan, a challenge to which is currently being heard in federal appeals court. At it’s core, the Clean Power Plan is about the EPA being able to regulate greenhouse gas emissions, a power the U.S. Supreme Court has already upheld three times.

The Supreme Court placed a temporary halt on the plan last year after 24 states sued to stop it. An appeals court ruling on whether the Clean Power Plan is constitutional is expected soon, and the decision is widely expected to be appealed to the Supreme Court.

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The Clean Power Plan was meant to cut emissions from existing coal-fired power plants. It was key to U.S. credibility during the 2015 Paris climate negotiations because it showed that the world that the United States was serious about cutting its climate pollution.

The reversal of the plan is likely to be interpreted abroad as the United States pulling out of the Paris pact even if it doesn’t do so officially, said Danny Cullenward, a professor of climate change law and economics at Stanford University.

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“Politically, it will rightly be recognized as the Trump administration thumbing its nose to the climate problem,” Cullenward said.

A White House official said Monday that the administration has not decided whether to seek to pull the United States out of the Paris Climate Agreement.

The United States has already ceded global leadership on climate change because under the Trump administration, it is no longer leading by example, said David Victor, co-director of the Laboratory on International Law and Regulation at the University of California-San Diego.

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“Even with the Obama-era rules, the U.S. would have had a hard time meeting the Paris pledge,” Victor said. “Today’s order makes that even less likely.”

The details of Tuesday’s executive order show the breadth of the Trump administration’s desire to dispense with existing U.S. climate and energy policy.

The order withdraws Obama’s 2013 electric power sector carbon pollution standards, which laid the groundwork for climate pollution controls for existing and newly built electric power plants.

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“We will unlock job-producing natural gas, oil and shale energy,” Trump said. “We will produce American coal to power American industry.”

But it’s natural gas, shale energy and technology that are the biggest factors in the coal industry’s downfall.

The United States, which is the third-largest crude oil producer and the largest natural gas producer in the world, has seen a flood of domestic shale oil and natural gas production over the past decade, contributing to a dramatic fall in global oil and gas prices. Cheap, abundant natural gas, along with federal mercury emissions regulations, have encouraged electric power companies to shut down coal-fired power plants and build new ones that run on natural gas. And technology has led to more automation in the coal industry, stripping away even more jobs.

The path toward a full unraveling of Obama-era climate policy is unclear because undoing the Clean Power Plan will require a long federal rulemaking process that will likely be mired for years in legal action.

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“The order itself accomplishes virtually nothing directly,” said Richard Revesz, a law professor and director of the Institute for Policy Integrity at NYU. “It will be implemented through the regulatory process. But any such efforts are going to be very cumbersome and will be tied up in litigation for a long time.”

Revesz said that in rewriting the Clean Power Plan, the EPA will have to explain the scientific and economic basis for why a weaker version is necessary. The new plan will also eventually end up in court.

“This issue might not be resolved before the 2020 election, so the fate of the Clean Power Plan might ultimately be determined by the winner of that election,” Revesz said.

The response to Trump’s order was swift and scathing from climate scientists and conservationists and jubilant from Trump supporters.

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"In the short term, there may be small job gains in the coal industry, but in the long term, U.S. companies will fall steadily behind the rest of the world where work will continue to aggressively improve efficiency, renewable technologies, electric vehicles, etc.,” said Drew Shindell, a climate scientist at Duke University.

“In the long run, U.S. companies will have a harder time selling their wares overseas if we stop accounting for 'social costs' and take other such actions to weaken our push toward environmentally friendly technologies,” he said. “So even from a jobs perspective, this is a bad move for America as a whole even if it benefits the fossil fuel industry.”

Michael Mann, a Penn State University climatologist, said the order is a signal to the world that the Trump administration cares more about fossil fuels than about the the health of the planet.

“Fortunately others, like China, are actually stepping up, decommissioning coal-fired power plants and flooding the global market with cheap solar panels,” Mann said. “They recognize that the U.S. vacuum in leadership provides them the opportunity to lead, both morally and economically, while we get left behind.”