The White House deleted references to climate change from a proposal limiting California’s ability to set stricter vehicle emissions standards.

On three separate occasions in September 2019, President Trump stated that Alabama was under threat from Hurricane Dorian even though no government weather forecast predicted any impact would be felt in the state.

The EPA informed staff that it would no longer oppose the Pebble Mine project in Alaska, disregarding previous EPA studies

President Trump issued an executive order directing federal agencies to terminate “at least one-third” of their current advisory committees. Critics argue that this will limit the scientific information and advice available to federal agencies and thus undermine science-based decision-making.

In a televised interview on Good Morning Britain, President Trump questioned the scientific consensus on climate change, asserting that weather patterns have “changed both ways.” The President also contracted scientific research showing that climate change is contributing to more frequent and severe extreme weather events.

White House officials ordered a senior scientist at the U.S. Department of State not to submit written testimony on the threats posed by climate change to the House Intelligence Committee.

Under the Trump Administration, 1.6 million acres of the Arctic National Wildlife Refuge in Alaska has been opened up for oil drilling. In the rush to complete the environmental review process before leasing can begin, scientists have been repeatedly ignored and sidelined.

As a result of budget cuts by the Trump Administration, 16 out of 22 Land Conservation Cooperative research centers have been placed on indefinite hiatus or completely eliminated.

President Trump posted a tweet which appeared to endorse erroneous claims, made by Patrick Moore, that climate change is “[f]ake [s]cience” and that increasing carbon dioxide emissions will benefit society.

The White House Office of Information and Regulatory Affairs deleted several references to “climate change” from an EPA guidance document titled “Planning for Natural Disaster Debris.” The deleted references highlighted the link between climate change and extreme weather events.

The Technical Mapping Advisory Council (TMAC) — a scientific panel charged with advising the Federal Emergency Management Agency — has not met in almost 5 months. During that period, TMAC has lacked a quorum, reportedly because the White House and Department of Homeland Security have delayed issuing security clearances to new members.

In a tweet discussing recent cold weather in the Midwest, President Trump appeared to suggest that climate change is not occurring, stating “[w]hat the hell is going on with Global Waming? [sic] Please come back fast, we need you!” The President’s statement was widely criticized by climate scientists, who emphasized that cold weather does not disprove the existence of climate change.

President Trump posted a tweet suggesting that recent cold weather in the U.S. disproves the existence of climate change. The President’s tweet was widely criticized by climate scientists, who noted that it confused short-term weather trends with longer-term changes in climate.

A White House spokesperson questioned the accuracy of the Fourth National Climate Assessment, claiming that it overstates the risks associated with climate change because it was “based on the most extreme scenario, which contradicts long-established trends.” That claim was disputed by climate scientists, including one of the Assessment’s authors, who noted that it “considers ALL scenarios.”

President Trump posted a tweet suggesting that recent cold weather in the U.S. disproves the existence of climate change. The President’s tweet was widely criticized by climate scientists, who argued that it confused short-term weather trends with longer-term changes in climate.

During a televised interview, President Trump questioned the scientific consensus on climate change, suggesting that scientists disagree on its causes. He also asserted that some scientists have overstated the role human activities play in climate change, saying “[w]e do have an impact but I don’t believe the impact is nearly what some scientists say.”

The White House published a new report, titled “Science and Technology for America’s Oceans,” identifying research priorities for oceans science and technology. The report omits a section discussing research priorities with respect to “the ocean’s role in climate,” which had appeared in all previous versions of the report.

Vice President Mike Pence questioned scientific research showing that climate change is primarily caused by greenhouse gas emissions, telling reporters that its causes “are yet to be seen.”

In a televised interview, President Trump questioned scientific research showing that anthropogenic greenhouse gas emissions are the primary driver of climate change, saying we “don’t know” what would have happened “with or without man.”

The White House Office of Management and Budget removed several paragraphs discussing climate change and its impact on human health from a proposed EPA rule. The removed paragraphs emphasized the particular vulnerability of “children, the elderly, and the poor . . . to climate-related health effects.”

The White House published a new National Biodefense Strategy, outlining measures to prevent and mitigate disease outbreaks. Despite numerous scientific studies finding that climate change will increase the risk of such outbreaks, it is not discussed anywhere in the strategy.

The White House Office of Management and Budget removed several paragraphs discussing climate change and its impact on human health from EPA’s regulatory impact analysis on the proposed Affordable Clean Energy Rule.

The White House Office of Management and Budget and Office of Science and Technology Policy jointly released a memorandum outlining the Trump administration’s research and development priorities. Unlike previous versions, issued during the Obama administration, the memorandum does not list climate change as a priority area.

White House and EPA officials sought to block publication of HHS study on the health effects of water contamination due to concerns that it would be a “public relations nightmare.”

The White House Office of Management and Budget has delayed the release of sustainability reports prepared by at least seven federal agencies under Executive Order 13693 (signed by President Obama in March 2015).

President Trump signed a memorandum directing the EPA Administrator to make changes to certain air pollution programs. The changes have implications for the use of science in developing and implementing air pollution protections.

The White House announced plans to restructure the interagency National Science and Technology Council, which was established in 1993 to coordinate science policy across the federal government. The restructure will be overseen by the Office of Science and Technology Policy, which has requested input from 20 federal agencies.

During an international television appearance, aired on ITV, President Trump misrepresented scientific data regarding climate change. The President made several incorrect statements, including suggesting that global temperatures are not increasing, and sea ice cover is not declining.

As of December 31, 2017, President Trump had filled fewer government science positions than any other recent President, at the same point in time. Just 20 of the 83 positions designated by the National Academies of Sciences as “science appointees” had been filled.

President Trump unveiled a new National Security Strategy, which omitted “climate change” from a list of global threats.

As of October 23, 2017, the Trump administration had taken longer than any other to nominate a science adviser to head the White House Office of Science and Technology Policy.

The White House Office of Management and Budget and Office of Science and Technology Policy jointly released a memorandum outlining the Trump administration’s research and development priorities. Unlike previous versions, issued during the Obama administration, the memorandum does not list climate change as a priority area.

The White House deleted links to the U.S. National Strategy for the Arctic and related documents from its website.

The White House website was re-launched with all references to “climate change” removed.

On December 20, 2017, Trump administration official ordered the Environmental Protection Agency to suspend all research grants.

The White House Office of Management and Budget issued new guidelines on the use of “influential scientific, financial, or statistical information” by federal agencies. The guidelines direct federal agencies to make the research underlying such information publicly available. Critics fear that this could prevent agencies relying on scientific studies that are based on confidential data which cannot be publicly disclosed.