Good morning and welcome to this week's environmental update. We're starting with breaking news from the EPA that's reshaping how America regulates its waters. On November 17th, EPA Administrator Lee Zeldin and the Army Corps of Engineers unveiled a proposed rule that fundamentally redefines what counts as waters of the United States under the Clean Water Act. This move follows a Supreme Court decision in Sackett and represents a significant shift in environmental policy under the Trump administration.
The new definition aims to provide what officials call regulatory certainty for farmers and businesses while protecting water resources. The proposal opens a 45-day public comment period, giving listeners a chance to weigh in on this major change. Agricultural groups are backing the narrower definition, arguing it reduces burdens and provides clarity. Environmental advocates, however, warn it could leave millions of acres of wetlands and miles of streams unprotected going forward.
But the water regulation story is just one piece of a much larger regulatory overhaul happening at the EPA right now. The agency is undertaking what it calls the biggest deregulatory action in US history. On August 1st, the EPA proposed repealing all greenhouse gas emission standards for light, medium, and heavy-duty vehicles, along with rescinding the 2009 Endangerment Finding that declared greenhouse gases a threat to public health. This would unwind decades of emissions regulations established under both Democratic and Republican administrations.
The power sector is also in the crosshairs. In June, the EPA proposed changes that could relax or repeal carbon pollution standards for power plants, which account for about 25 percent of US greenhouse gas emissions. Supporters argue these changes will improve grid reliability and lower energy costs. Opponents worry about increased emissions of mercury, arsenic, and selenium in waterways.
Perhaps most immediately affecting public health, on November 24th, the EPA moved to abandon stricter limits on fine particulate matter pollution. The Biden administration's 2024 standard could have prevented up to 4,500 premature deaths and 800,000 asthma cases annually. The EPA is now asking courts to revert to weaker 2020 standards, effectively siding with industry challengers rather than defending its own rule.
These changes will face significant legal challenges from environmental groups and states. The final impact depends on how courts interpret EPA authority under the Clean Air Act and Clean Water Act. For listeners concerned about these developments, the EPA website provides details on all proposed rules, and public comment periods offer opportunities to make your voice heard.
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