The Trump administration has told federal agencies they should no longer take climate change into account when measuring infrastructure projects, according to two senior administration officials.

The proposed changes to the 50-year-old National Environmental Policy Act (Nepa) are aimed at speeding approvals for pipelines, oil and gas leases, highway construction and other kinds of development.

The Nepa law, last updated in 1978, has proved to be one of the most potent stumbling blocks to Mr Trump’s push to accelerate oil, gas, and coal extraction across the country.

Under the Nepa, agencies are required to analyse the extent to which proposed federal actions affect everything from endangered species to water quality to greenhouse gas emissions linked to climate change.

Under the Obama administration, the Environmental Protection Agency raised objections during a Nepa review of the massive Keystone XL pipeline in Montana which resulted in it being delayed.

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More recently, federal judges halted oil and gas leasing in Wyoming as well as the Trump administration’s push to restart coal leasing on public land on the grounds that the Interior Department did not properly assess the climate impacts of these decisions.

Two administration officials, speaking anonymously because the proposed changes will not be announced until next week, said the plan would shorten the timeframe for the environmental reviews. The reviews will also no longer consider the cumulative impacts of a project, they said.

“Climate change is no longer a top priority for these reviews,” one official said.

The New York Times first reported details of the proposal on Friday evening.

In a statement on 1 January, the Nepa law’s 50th anniversary, Mr Trump criticised the extent to which it has delayed projects.

“While the goals of Nepa remain the same as they did 50 years ago, the environmental review process designed to improve decision-making has become increasingly complex and difficult to navigate,” the president said.

“Project sponsors and ordinary Americans seeking decisions on permits from the federal government can face significant uncertainty and delays that can increase costs, derail important projects, and threaten jobs for American workers and labour union members.”

Donald Trump clashed with Native American protesters who condemned an oil pipeline on sacred land (AP)

Stephen Schima, senior legislative counsel for the firm Earthjustice, said the impact of the proposal could be enormous. Nepa “sets the floor” for how more than 80 federal agencies solicit public input and evaluate the government’s impact on the environment, he said.

“They’re clearly trying to institutionalise climate denial into federal decision making,” Mr Schima said. “This is the existential threat to how the government incorporates climate change into their decision-making process.”

The regulations would have to be finalised before they could take effect, and environmental groups are sure to challenge them in court.

Protesters burnt their Oceti Sakowin camp before the army’s evacuation deadline in 2017 (Getty) (Getty Images)

Both industry and some unions officials have urged the White House to overhaul the decades-old policy and make it easier to launch transit and highway projects, drilling and other developments. Mr Trump is particularly interested in the plan because he believes it will accelerate the construction of pipelines across the country.

“Potus is obsessed with pipelines,” one official said. “He wants to get these pipelines built.”

Barely a month ago, a collection of major industry groups – including the American Petroleum Institute, National Association of Home Builders and the American Chemistry Council – wrote to administration officials that overhauling Nepa would boost the economy.

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“Reducing delays and uncertainties associated with infrastructure investment and related projects has the potential to support more and better-paying jobs throughout the country,” the coalition wrote to the head of the White House’s Council on Environmental Quality.

“Improved regulatory predictability would allow businesses to plan and invest with confidence while enhancing economic productivity and efficiency.”

Daniel Schneider, a spokesman for the White House Council on Environmental Quality, declined to comment in detail about the proposal. But in an email, he noted: “CEQ’s Nepa regulations have not been comprehensively updated in more than 40 years.

“President Trump promised a more efficient process to provide Americans timely decisions on permits for vital infrastructure projects that provide good jobs, reduce traffic congestion, and enhance the quality of life in neighbourhoods across our great country,

“The Trump administration is focused on improving the environmental review and permitting process while ensuring a safe, healthy, and productive environment for all Americans.”