By NADJA POPOVICH, LIVIA ALBECK-RIPKA and KENDRA PIERRE-LOUIS UPDATED June 7, 2019

President Trump has made eliminating federal regulations a priority. His administration, with help from Republicans in Congress, has often targeted environmental rules it sees as burdensome to the fossil fuel industry and other big businesses.

A New York Times analysis, based on research from Harvard Law School, Columbia Law School and other sources, counts more than 80 environmental rules and regulations on the way out under Mr. Trump.

Our list represents two types of policy changes: rules that were officially reversed and rollbacks still in progress. The Trump administration has released an aggressive schedule to try to finalize many of these rollbacks this year.

49 34 83
ROLLBACKS COMPLETED ROLLBACKS IN PROCESS TOTAL ROLLBACKS
Air pollution and emissions 10 12 22
Drilling and extraction 9 9 18
Infrastructure and planning 12 1 13
Animals 8 2 10
Toxic substances and safety 3 2 5
Water pollution 4 3 7
Other 3 5 8
The Trump administration has often used a “one-two punch” when rolling back environmental rules, said Caitlin McCoy, a fellow in the Environmental and Energy Law Program at Harvard Law School who tracks regulatory rollbacks. “First a delay rule to buy some time, and then a final substantive rule.”

But the process of rolling back regulations has not always been smooth. In some cases, the administration has failed to provide a strong legal argument in favor of proposed changes or agencies have skipped key steps in the rulemaking process, like notifying the public and asking for comment. In several cases, courts have ordered agencies to enforce their own rules.

Several environmental rules — summarized at the bottom of this page — were rolled back and then later reinstated, often following legal challenges. Other rollbacks remain mired in court.

All told, the Trump administration’s environmental rollbacks could significantly increase greenhouse gas emissions and lead to thousands of extra deaths from poor air quality every year, according to a recent report prepared by New York University Law School's State Energy and Environmental Impact Center.

Here are the details for each of the policies targeted by the administration so far. Are there rollbacks we missed? Email climateteam@nytimes.com or tweet @nytclimate.

Air pollution and emissions
COMPLETED

1. Canceled a requirement for oil and gas companies to report methane emissions.
   Environmental Protection Agency | Read more
2. Revised and partially repealed an Obama-era rule limiting methane emissions on public lands, including intentional venting and flaring from drilling operations.
   Interior Department | Read more
3. Loosened a Clinton-era rule designed to limit toxic emissions from major industrial polluters.
   E.P.A. | Read more
4. Stopped enforcing a 2015 rule that prohibited the use of hydrofluorocarbons, powerful greenhouse gases, in air-conditioners and refrigerators.
   E.P.A. | Read more
5. Repealed a requirement that state and regional authorities track tailpipe emissions from vehicles traveling on federal highways.
   Transportation Department | Read more
6. Reverted to a weaker 2009 pollution permitting program for new power plants and expansions.
   E.P.A. | Read more
7. Amended rules that govern how refineries monitor pollution in surrounding communities.
   E.P.A. | Read more
8. Directed agencies to stop using an Obama-era calculation of the “social cost of carbon” that rulemakers used to estimate the long-term economic benefits of reducing carbon dioxide emissions.
   Executive Order | Read more
9. Withdrew guidance that federal agencies include greenhouse gas emissions in environmental reviews. But several district courts have ruled that emissions must be included in such reviews.
   Executive Order; Council on Environmental Quality | Read more
10. Lifted a summertime ban on the use of E15, a gasoline blend made of 15 percent ethanol. (Burning gasoline with a higher concentration of ethanol in hot conditions increases smog.)
    E.P.A. | Read more
    IN PROCESS
11. Proposed weakening Obama-era fuel-economy standards for cars and light trucks. The proposal also challenges California’s right to set its own more stringent standards, which other states can choose to follow.
    E.P.A. and Transportation Department | Read more
12. Announced intent to withdraw the United States from the Paris climate agreement. (The process of withdrawing cannot be completed until 2020.)
    Executive Order | Read more
13. Proposed repeal of the Clean Power Plan, which would have set strict limits on carbon emissions from coal- and gas-fired power plants. In April 2019, the E.P.A. sent a replacement plan, which would let states set their own rules, to the White House for budget review.
    Executive Order; E.P.A. | Read more
14. Proposed eliminating Obama-era restrictions that in effect required newly built coal power plants to capture carbon dioxide emissions.
    E.P.A. | Read more
15. Proposed a legal justification for weakening an Obama-era rule that limited mercury emissions from coal power plants.
    E.P.A. | Read more
16. Proposed revisions to standards for carbon dioxide emissions from new, modified and reconstructed power plants.
    Executive Order; E.P.A. | Read more
17. Began review of emissions rules for power plant start-ups, shutdowns and malfunctions. In April, the E.P.A. filed an order reversing a requirement that 36 states follow the emissions rule.
    E.P.A. | Read more
18. Proposed relaxing Obama-era requirements that companies monitor and repair methane leaks at oil and gas facilities.
    E.P.A. | Read more
19. Proposed changing rules aimed at cutting methane emissions from landfills. In May, 2019, a federal judge ruled against the E.P.A. for failing to enforce the existing law and gave the agency a fall deadline for finalizing state and federal rules. E.P.A. said it is reviewing the decision.
    E.P.A. | Read more
20. Announced a rewrite of an Obama-era rule meant to reduce air pollution in national parks and wilderness areas.
    E.P.A. | Read more
21. Weakened oversight of some state plans for reducing air pollution in national parks. (In Texas, the E.P.A. rejected an Obama-era plan that would have required the installation of equipment at some coal-burning power plants to reduce sulfur dioxide emissions.)
    E.P.A. | Read more
22. Proposed repealing leak-repair, maintenance and reporting requirements for large refrigeration and air conditioning systems containing hydrofluorocarbons.
    E.P.A. | Read more
    Drilling and extraction
    COMPLETED
23. Made significant cuts to the borders of two national monuments in Utah and recommended border and resource management changes to several more.
    Presidential Proclamation; Interior Department | Read more
24. Rescinded water pollution regulations for fracking on federal and Indian lands.
    Interior Department | Read more
25. Scrapped a proposed rule that required mines to prove they could pay to clean up future pollution.
    E.P.A. | Read more
26. Withdrew a requirement that Gulf oil rig owners prove they could cover the costs of removing rigs once they have stopped producing.
    Interior Department | Read more
27. Approved construction of the Dakota Access pipeline less than a mile from the Standing Rock Sioux reservation. Under the Obama administration, the Army Corps of Engineers had said it would explore alternative routes.
    Executive Order; Army | Read more
28. Revoked an Obama-era executive order designed to preserve ocean, coastal and Great Lakes waters in favor of a policy focused on energy production and economic growth.
    Executive Order | Read more
29. Changed how the Federal Energy Regulatory Commission considers the indirect effects of greenhouse gas emissions in environmental reviews of pipelines.
    Federal Energy Regulatory Commission | Read more
30. Permitted the use of seismic air guns for gas and oil exploration in the Atlantic Ocean. The practice, which can kill marine life and disrupt fisheries, was blocked under the Obama administration.
    National Oceanic and Atmospheric Administration | Read more
31. Loosened offshore drilling safety regulations implemented by the Obama administration following the 2010 Deepwater Horizon explosion and oil spill. The revised rules include reduced testing requirements for blowout prevention systems.
    Interior Department | Read more
    IN PROCESS
32. Completed preliminary environmental reviews to clear the way for drilling in the Arctic National Wildlife Refuge.
    Congress; Interior Department | Read more
33. Proposed opening most of America’s coastal waters to offshore oil and gas drilling, but delayed the plan after a federal judge ruled that Mr. Trump’s reversal of an Obama-era ban on drilling in the Arctic Ocean was unlawlful.
    Interior Department | Read more
34. Lifted an Obama-era freeze on new coal leases on public lands. But, in April 2019, a judge ruled that the Interior Department could not begin selling new leases without completing an environmental review. A month later, the agency published a draft assessment that concluded restarting federal coal leasing would have little environmental impact.
    Executive Order; Interior Department | Read more
35. Repealed an Obama-era rule governing royalties for oil, gas and coal leases on federal lands, which replaced a 1980s rule that critics said allowed companies to underpay the federal government. A federal judge struck down the Trump administration’s repeal. The Interior Department is reviewing the decision.
    Interior Department | Read more
36. Proposed “streamlining” the approval process for drilling for oil and gas in national forests.
    Agriculture Department; Interior Department | Read more
37. Ordered review of regulations on oil and gas drilling in national parks where mineral rights are privately owned.
    Executive Order; Interior Department | Read more
38. Recommended shrinking three marine protected areas, or opening them to commercial fishing.
    Executive Order; National Oceanic and Atmospheric Administration | Read more
39. Ordered review of regulations on offshore oil and gas exploration by floating vessels in the Arctic that were developed after a 2013 accident. The Interior Department said it was “considering full rescission or revision of this rule.”
    Executive Order; Interior Department | Read more
40. Approved the Keystone XL pipeline rejected by President Barack Obama, but a federal judge blocked the project from going forward without an adequate environmental review process. Mr. Trump later attempted to side-step the ruling by issuing a presidential permit, but the project remains tied up in court.
    Executive Order; State Department | Read more
    Infrastructure and planning
    COMPLETED
41. Revoked Obama-era flood standards for federal infrastructure projects, like roads and bridges. The standards required the government to account for sea-level rise and other climate change effects.
    Executive Order | Read more
42. Relaxed the environmental review process for federal infrastructure projects.
    Executive Order | Read more
43. Revoked a directive for federal agencies to minimize impacts on water, wildlife, land and other natural resources when approving development projects.
    Executive Order | Read more
44. Revoked an Obama executive order promoting “climate resilience” in the northern Bering Sea region of Alaska, which withdrew local waters from oil and gas leasing and established a tribal advisory council to consult on local environmental issues.
    Executive Order | Read more
45. Revoked an Obama executive order that set a goal of cutting the federal government’s greenhouse gas emissions by 40 percent over 10 years.
    Executive Order | Read more
46. Reversed an update to the Bureau of Land Management’s public land use planning process.
    Congress | Read more
47. Withdrew an Obama-era order to consider climate change in managing natural resources in national parks.
    National Park Service | Read more
48. Restricted most Interior Department environmental studies to one year in length and a maximum of 150 pages, citing a need to reduce paperwork.
    Interior Department | Read more
49. Withdrew a number of Obama-era Interior Department climate change and conservation policies that the agency said could “burden the development or utilization of domestically produced energy resources.”
    Interior Department | Read more
50. Eliminated the use of an Obama-era planning system designed to minimize harm from oil and gas activity on sensitive landscapes, such as national parks.
    Interior Department | Read more
51. Eased the environmental review processes for small wireless infrastructure projects with the goal of expanding 5G wireless networks.
    Federal Communications Commission | Read more
52. Withdrew Obama-era policies designed to maintain or, ideally improve, natural resources affected by federal projects.
    Interior Department | Read more
    IN PROCESS
53. Proposed plans to streamline the environmental review process for Forest Service projects.
    Agriculture Department | Read more
    Animals
    COMPLETED
54. Opened nine million acres of Western land to oil and gas drilling by weakening habitat protections for the sage grouse, an imperiled bird with an elaborate mating dance.
    Interior Department | Read more
55. Overturned a ban on the use of lead ammunition and fishing tackle on federal lands.
    Interior Department | Read more
56. Overturned a ban on the hunting of predators in Alaskan wildlife refuges.
    Congress | Read more
57. Ended an Obama-era rule barring hunters on some Alaska public lands from using bait to lure and kill grizzly bears.
    National Park Service; Interior Department | Read more
58. Withdrew proposed limits on the number of endangered marine mammals and sea turtles that people who fish could unintentionally kill or injure with sword-fishing nets on the West Coast. In 2018, California issued a state rule prohibiting the use of the nets the rule was intending to regulate.
    National Oceanic and Atmospheric Administration | Read more
59. Amended fishing regulations for a number of species to allow for longer seasons and higher catch rates.
    National Oceanic and Atmospheric Administration | Read more
60. Rolled back a roughly 40-year-old interprentation of a policy aimed at protecting migratory birds, potentially running afoul of treaties with Canada and Mexico.
    Interior Department | Read more
61. Overturned a ban on using parts of migratory birds in handicrafts made by Alaskan Natives.
    Interior Department | Read more
    IN PROCESS
62. Proposed stripping the Endangered Species Act of key provisions.
    Interior Department | Read more
63. Proposed relaxing environmental protections for salmon and smelt in California’s Central Valley in order to free up water for farmers.
    Executive Order; Interior Department | Read more
    Toxic substances and safety
    COMPLETED
64. Narrowed the scope of a 2016 law mandating safety assessments for potentially toxic chemicals, like dry-cleaning solvents and paint strippers. The E.P.A. will focus on direct exposure and exclude air, water and ground contamination.
    E.P.A. | Read more
65. Reversed an Obama-era rule that required braking system upgrades for “high hazard” trains hauling flammable liquids, like oil and ethanol.
    Transportation Department | Read more
66. Removed copper filter cake, an electronics manufacturing byproduct comprised of heavy metals, from the “hazardous waste” list.
    E.P.A. | Read more
    IN PROCESS
67. Rejected a proposed ban on chlorpyrifos, a potentially neurotoxic pesticide. In August 2018, a federal court ordered the E.P.A. to ban the pesticide, but the agency is appealing the ruling.
    E.P.A. | Read more
68. Announced a review of an Obama-era rule lowering coal dust limits in mines. The head of the Mine Safety and Health Administration said there were no immediate plans to change the dust limit, but the review is continuing.
    Labor Department | Read more
    Water pollution
    COMPLETED
69. Revoked a rule that prevented coal companies from dumping mining debris into local streams.
    Congress | Read more
70. Withdrew a proposed rule aimed at reducing pollutants, including air pollution, at sewage treatment plants.
    E.P.A. | Read more
71. Withdrew a proposed rule requiring groundwater protections for certain uranium mines.
    E.P.A. | Read more
72. Weakened federal rules regulating the disposal and storage of coal ash waste from power plants. (A second phase of this rollback is still under way.)
    E.P.A. | Read more
    IN PROCESS
73. Proposed rolling back protections for certain tributaries and wetlands that the Obama administration wanted covered by the Clean Water Act.
    E.P.A.; Army | Read more
74. Delayed by two years an E.P.A. rule regulating limits on toxic discharge, which can include mercury, from power plants into public waterways.
    E.P.A. | Read more
75. Ordered the E.P.A. to re-evaluate a section of the Clean Water Act and related guidance that allows states to reject or delay federal projects – including pipelines and other fossil fuel facilities – if they don't meet local water quality goals.
    Executive Order; E.P.A. | Read more
    Other
    COMPLETED
76. Prohibited funding environmental and community development projects through corporate settlements of federal lawsuits.
    Justice Department | Read more
77. Announced intent to stop payments to the Green Climate Fund, a United Nations program to help poorer countries reduce carbon emissions.
    Executive Order | Read more
78. Reversed restrictions on the sale of plastic water bottles in national parks desgined to cut down on litter, despite a Park Service report that the effort worked.
    Interior Department | Read more
    IN PROCESS
79. Proposed limiting the studies used by the E.P.A. for rulemaking to only those that make data publicly available. (The move was widely criticized by scientists, who said it would effectively block the agency from considering landmark research that relies on confidential health data.)
    E.P.A. | Read more
80. Proposed repealing an Obama-era regulation that nearly doubled the number of light bulbs subject to energy-efficiency standards set to go into effect next year.
    Energy Department | Read more
81. Proposed changes to the way cost-benefit analyses are conducted under the Clean Air Act, Clean Water Act and other environmental statutes.
    E.P.A. | Read more
82. Proposed withdrawing efficiency standards for residential furnaces and commercial water heaters designed to reduce energy use.
    Energy Department | Read more
83. Initially withdrew then delayed a proposed rule that would inform car owners about fuel-efficient replacement tires. (The Transportation Department has scheduled a new rulemaking notice for 2020.)
    Transportation Department | Read more
    10 rules were reinstated, often
    following lawsuits and other challenges
84. Reinstated a rule aimed at improving safety at facilities that use hazardous chemicals following a federal court order.
    E.P.A. | Read more
85. Reversed course on repealing emissions standards for “glider” trucks — vehicles retrofitted with older, often dirtier engines — after Andrew Wheeler took over as head of the E.P.A.
    E.P.A. | Read more
86. Delayed a compliance deadline for new national ozone pollution standards by one year, but later reversed course.
    E.P.A. | Read more
87. Suspended an effort to lift restrictions on mining in Bristol Bay, Alaska. But the Army Corps of Engineers is performing an environmental review of an application for mining in the area.
    E.P.A.; Army | Read more
88. Delayed implementation of a rule regulating the certification and training of pesticide applicators, but a judge ruled that the E.P.A. had done so illegally and declared the rule in effect.
    E.P.A. | Read more
89. Initially delayed publishing efficiency standards for household appliances, but later published them after multiple states and environmental groups sued.
    Energy Department | Read more
90. Delayed federal building efficiency standards until Sept. 30, 2017, at which time the rules went into effect.
    Energy Department | Read more
91. Reissued a rule limiting the discharge of mercury by dental offices into municipal sewers after a lawsuit by the Natural Resources Defense Council, an advocacy group.
    E.P.A. | Read more
92. Re-posted a proposed rule limiting greenhouse gas emissions from aircraft, after initially changing its status to “inactive” on the E.P.A. website. In May 2019, the agency confimed it would issue the rule.
    E.P.A. | Read more
93. Removed the Yellowstone grizzly bear from the Endangered Species List, but the protections were later reinstated by a federal judge. (The Trump administration appealed the ruling in May 2019.)
    Interior Department | Read more