Trump seeks to overturn key climate science ruling on greenhouse gases

Trump Administration Proposes Repeal of Key Climate Regulations

The Trump administration is taking a significant step to dismantle long-standing climate regulations by proposing the repeal of the 2009 endangerment finding, which established that greenhouse gas (GHG) emissions pose a threat to public health and welfare. This move would also lead to the removal of all climate-related rules governing cars and trucks, marking a major shift in U.S. environmental policy.

Environmental Protection Agency (EPA) Administrator Lee Zeldin made the announcement during a speech in Indianapolis on Tuesday, stating that the agency is working to rescind the Obama-era findings. The endangerment finding served as the foundation for numerous climate regulations, including those that set emissions standards for vehicles. By removing these rules, automakers would no longer be required to comply with any climate-related regulations.

This proposal represents a more aggressive approach than the first Trump administration, which had left the endangerment finding intact but significantly weakened existing regulations. Zeldin described the move as “the largest deregulatory action in the history of the United States.” In a written statement, he claimed that the EPA heard concerns from Americans about the negative impact of GHG emissions standards, even though carbon dioxide itself was never assessed independently in the original finding.

The 2009 endangerment finding concluded that emissions of carbon dioxide, methane, and other greenhouse gases threaten public health and welfare, with vehicle emissions being a contributing factor. However, the Trump administration now plans to argue that there is insufficient reliable information to support the conclusion that GHG emissions from new motor vehicles contribute to endangerment.

While the immediate impacts of this proposal appear to be focused on the auto industry, it does not directly affect other sectors like power plants. Nevertheless, in June, the Trump administration separately proposed to find that power plant emissions do not significantly contribute to dangerous air pollution and therefore should not be regulated.

According to the administration, repealing climate regulations on cars and trucks could generate between $157 billion and $444 billion in benefits between 2027 and 2055. This includes projected savings from changes in the vehicle market, such as fewer electric vehicles compared to Biden-era rules. However, if finalized, these changes are expected to increase carbon dioxide emissions, worsening the effects of climate change.

The Biden administration estimated that its latest regulations on light- and medium-duty vehicles would prevent 7.2 billion tons of carbon dioxide emissions through 2055—four times the total emissions from the entire U.S. transportation sector in 2021. These rules also aim to reduce pollutants like soot, which are linked to gas-powered vehicles.

This proposal is part of a broader effort by the Trump administration to reduce government regulations and weaken climate change mitigation efforts. Human activity, particularly the burning of fossil fuels, is the primary driver of climate change, which is intensifying extreme weather events globally.

The move comes amid a summer marked by severe weather disasters, including deadly flooding in Texas that claimed over 130 lives and widespread flooding across the country, along with extreme heat on the East Coast. In conjunction with the EPA’s decision, the Energy Department released a report suggesting that CO2-induced warming may be less economically damaging than previously believed. Energy Secretary Chris Wright has a history of downplaying the impacts of climate change.

President Trump has long campaigned on repealing climate regulations on cars, arguing that they harm the auto industry and limit consumer choices. Zeldin has previously indicated plans to revisit both the endangerment finding and climate regulations.

The EPA’s endangerment finding was initially established in 2009 following the Massachusetts v. EPA court case, which allowed the EPA to regulate planet-warming emissions under the Clean Air Act if they were found to pose a threat to the public. However, the current proposal is not yet final and will need to go through a public comment period before it can be finalized.

Democrats have strongly criticized the proposal, calling it harmful and unscientific. Senator Ed Markey (D-Mass.) stated, “Arguing that greenhouse gas emissions don’t put us in danger by causing climate change is like saying that a lit match can’t put us in danger by burning down the house.” He added, “This is nothing more than selling out Americans’ safety and future just for the convenience of polluters.”