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This Aug. 10 file photo shows the California Air Resources Board's Arie Jan Haagen-Smit Laboratory, where emissions from thousands of cars, motorcycles and other vehicles are tested each year, in El Monte, Calif.
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Trump administration, under legal pressure, reverses itself on measuring greenhouse gases from cars and trucks

Melissa Lyttle/The New York Times

Trump administration, under legal pressure, reverses itself on measuring greenhouse gases from cars and trucks

Following a lawsuit by California and seven other states, the Trump administration on Thursday reversed course and instituted new regulations requiring that greenhouse gases from cars and trucks be measured and compared over time.

The regulation had been published two days before the Obama administration left office, and was repeatedly delayed by President Donald Trump’s Department of Transportation. The transportation sector is one of the top sources of emissions causing global warming.

“Today, the Trump Administration backed down and will now implement the measure as is legally required,” California Attorney General Xavier Becerra said in a statement. “Climate change is real. If President Trump is not prepared to admit it or to do his job of protecting our families by enforcing our environmental rules, then I’m prepared as Attorney General to call his bluff.”

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California and the other states - Iowa, Maryland, Massachusetts, Minnesota, Washington, Oregon and Vermont - alleged in the suit, filed last week, that the administration had intentionally, and unlawfully, failed to give people the required opportunity to comment on the indefinite delay. Environmental groups had sued over the issue earlier as well.

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The U.S. Department of Transportation did not immediately comment, though a senior administration official acknowledged the reversal.

Trump has blamed federal regulations and environmental rules for contributing to what he claims is America’s “Third World” infrastructure. He has pushed to sharply reduce environmental enforcement and repeatedly rejected the scientific consensus on the dangers of climate change.

Some states and industry groups had objected to the greenhouse gas requirement.

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The American Trucking Associations said in July that the “requirement is likely to lead to permitting delays and required mitigations that will add costs and time to projects.”

The Utah Department of Transportation also voiced its opposition, saying the Obama-era regulation “exceeds the scope established by Congress” and was an attempt to “advance climate-related issues that could not be advanced through other legitimate legislative avenues.”

In its notice Thursday in the Federal Register, the Federal Highway Administration said it “recognizes that there are short time frames to comply with the October 1, 2018 reporting deadline” but expects that the burden to comply “will be minimal, consisting mostly of preliminary target-setting activities using existing data sources.”

The rule calls on state departments of transportation to come up with a baseline for current carbon dioxide emissions from all cars, trucks and motorcycles on the national highway system, which includes interstates and some other roads.

States and regional planning officials would then calculate 2017 totals using “motor fuel sales volumes already reported” to Washington, along with figures on emissions per gallon and miles traveled, according to federal documents.

State and metropolitan area officials would gauge the percentage change over time and be required to “establish targets and report on progress,” with the Federal Highway Administration assessing that progress every two years, according to a federal description of the rules.

“Important rules such as this one take a year or so to develop, with adequate comment periods (this one’s spanned four months). A new administration can’t just willy-nilly decline to follow through,” according to the Natural Resources Defense Council, which along with Clean Air Carolina and the U.S. Public Interest Research Group, sued Transportation Secretary Elaine Chao over the matter in July.

But Trump officials have indicated that they expect Thursday’s setback will be short-lived.

Last month, the Department of Transportation said it would launch a new regulatory process to gather additional information and public comments on the greenhouse gas requirement, which would aid federal highway officials “in determining whether the measure should be retained, revised or repealed.”

But in Thursday’s notice, the administration was more explicit about its intentions, saying the Federal Highway Administration “has initiated additional rulemaking procedures proposing to repeal the [greenhouse gas] measure.” It said a formal notice outlining that effort would be published this year, with a goal of putting it into place by spring 2018 - before the first compliance deadline.

First Published: September 29, 2017, 1:47 a.m.

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This Aug. 10 file photo shows the California Air Resources Board's Arie Jan Haagen-Smit Laboratory, where emissions from thousands of cars, motorcycles and other vehicles are tested each year, in El Monte, Calif.  (Melissa Lyttle/The New York Times)
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