WASHINGTON (AP) — While President Donald Trump’s beliefs about global warming remain something of a mystery, his actions make one thing clear: He doesn’t consider it a problem for the federal government to solve.

Trump’s recent decision to pull out of the Paris climate deal was just his latest rapid-fire move to weaken or dismantle federal initiatives to reduce carbon emissions, which scientists say are heating the planet to levels that could have disastrous consequences.

Trump is waging war against efforts to curb U.S. dependence on fossil fuels. He’s done that through executive orders targeting climate change programs and regulations, massive proposed spending cuts and key appointments such as Scott Pruitt as chief of the Environmental Protection Agency.

To what degree Trump will succeed remains to be seen. Despite the fanfare of his Paris announcement, including a pledge his administration will halt all work on it, formally removing the U.S. from the accord could take more than three years. Rescinding the Clean Power Plan, President Barack Obama’s signature measure to curb emissions from coal-fired power plants, likely would require three years.

Environmentalists are predictably outraged. Even some Republicans are taken aback.

“This is a repudiation of 45 years of steady improvement in the enforcement and rigor of laws to protect the environment in the U.S.,” said William K. Reilly, who led the EPA under President George H.W. Bush and is chairman emeritus of the World Wildlife Fund.

Trump’s administration reversed Obama’s moratorium on leasing federal lands for coal mining, joined with Congress to kill protections of streams from coal mining waste, stopped tracking the federal government’s carbon emissions and withdrew a requirement for more emissions data from oil and gas facilities. A rollback of automobile fuel-economy standards is under consideration. His proposed 2018 budget would cut climate and energy research spending in numerous agencies, including a two-thirds reduction at EPA.

Trump is hardly the first president accused of favoring businesses over the environment. What sets him apart is his zealousness and public dismissiveness of the scientific evidence showing the Earth is warming and man-made carbon emissions are largely to blame.

“This is more extreme than any previous Republican president — this is their old set of sentiments on steroids,” said David Doniger, a senior attorney with the Natural Resources Defense Council.