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Over four years in office, the Trump administration has dismantled major climate policies and rolled back many more rules governing clean air, water, wildlife and toxic chemicals. While other administrations have emphasized cutting regulations, calling them burdensome to industries like coal, oil and gas, the scope of actions under Mr.

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In all, a New York Times analysis, based on research from Harvard Law SchoolColumbia Law School and other sources, counts more than 70 environmental rules and regulations officially reversed, revoked or otherwise rolled back under Mr. Another 26 rollbacks are still in progress. The bulk of the rollbacks identified by the Times have been carried out by the Environmental Protection Agency, which has weakened Obama-era limits on planet-warming carbon dioxide emissions from power plants and from cars and trucks ; removed protections from more than half the nation's wetlands ; and withdrawn the legal justification for restricting mercury emissions from power plants.

At the same time, the Interior Department has worked to open up more land for oil and gas leasing by limiting wildlife protections and weakening environmental requirements for projects. But environmental and legal groups said the rollbacks have not served that mission.

Vizcarra, who has tracked environmental rollbacks for Harvard sincesaid the agency under Mr. Trump has often limited its own power to regulate environmental harm, especially when it comes to climate change. Many of the rollbacks are facing legal challenges by states, environmental groups and others.

Some rollbacks have already been struck down in court.

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They are summarized at the bottom of this page, and are not counted in our overall tally. Other reversals that were overturned in the courts were later revised by the administration and remain in effect.

Are there rollbacks we missed? Email climateteam nytimes. These rules were initially reversed by the Trump administration but were later reinstated, often following lawsuits and other challenges.

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Please upgrade your browser. See next articles. Rule reversals. Air link and emissions. Drilling and extraction. Infrastructure and planning. Water pollution. Toxic substances and safety. Below, we have summarized each rule that has been targeted for reversal. Jump to section Air pollution and emissions Drilling and extraction Infrastructure and planning Critters Toxic substances and safety Water pollution Other Reinstated rules. Weakened Obama-era fuel economy and greenhouse gas standards for passenger cars and light trucks.

Withdrew the legal justification for an Obama-era rule that limited mercury emissions from coal power plants. Replaced the Obama-era Clean Power Planwhich would have set strict limits on carbon emissions from coal- and gas-fired power plants, with a new version that would let states set their own rules. Executive Order; E. Canceled a requirement for oil and gas companies to report methane emissions. Revised and partially repealed an Obama-era rule limiting Modern Day Era And Its Impact On emissions on public landsincluding intentional venting and flaring from drilling operations. However, the Obama-era rule was later partially struck down in more info separate court case, during which the Trump administration declined to defend it.

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Withdrew a Clinton-era rule designed to limit toxic emissions from major industrial pollutersand later proposed codifying the looser standards. Revised a program designed to safeguard communities from increases in pollution from new power plants to make it easier for facilities to avoid emissions regulations. Amended rules that govern how refineries monitor pollution in surrounding communities. Weakened an Obama-era rule meant to reduce air pollution in national parks and wilderness areas. Weakened oversight of some state plans for reducing air pollution in national parks.]