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Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame

Union of Concerned Scientists

are formed indirectly in the atmosphere from other toxic pollutants also emitted from tailpipes. percent of US CO 2 emissions , are all from fossil fuel combustion in our vehicles, with the vast majority coming from pick-up trucks, SUVs and cars. Internal combustion vehicles are largely to blame, since PM 2.5 Secondary PM 2.5

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Good & Bad Environmental News From the U.S. Supreme Court

Legal Planet

Environmental Protection Agency, agreeing to decide whether fossil fuel manufacturers have legal standing to challenge an EPA decision under the federal Clean Air Act. That court ruled that the fossil fuel company plaintiffs had failed to establish their legal authority (i.e., “standing”) to bring the action.

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Sabin Center Submits Comment Letters on EPA’s Proposed Repeal of Power Plant GHG Emission Standards

Law Columbia

On June 17, 2025, EPA published a proposed rule to either repeal entirely, or significantly revise, a rule issued in 2024 which set performance standards for fossil fuel-fired power plants to limit their greenhouse gas (GHG) emissions. This week, the Sabin Center filed three comment letters opposing the proposal.

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The Emperor’s New Endangerment Theory (Part I)

Legal Planet

It empowers EPA to issue pollution control requirements covering new facilities in the industry. That provision doesn’t reference whatever pollutants may have been considered prior to placement on the list. In other words, the risks posed by individual pollutants are only referenced up to the time the industry is listed.

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EPA Pulls Back Regulations Setting Methane Emission Limits, Regulating Wastewater From Oil & Gas Operations, Risk Management Rule At Petrochemical Plants

PA Environment Daily

Methane Emissions EPA announced it would reconsider regulations for the oil and gas industry under Section 111 of the Clean Air Act and Subpart W of the Greenhouse Gas Reporting Program. EPA also announced it would reconsider risk management rules that cover oil and natural gas refineries and chemical facilities.

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EPA Moves to Ignore Power Plant Carbon Emissions, Deny Climate Science 

Union of Concerned Scientists

EPA issued a proposal that attempts to entirely remove the agency from regulating carbon emissions from current and future fossil fuel-fired power plants (coal, gas, and oil). Plus, a rundown on how to fight back. What is EPA proposing to do? How is EPA proposing to justify the repeal? This is not a joke.

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The Serious Risks Around Treatment of Biomethane in 45V

Union of Concerned Scientists

methane released from fossil fuel systems) could entirely undermine the climate benefits of the hydrogen tax credit and, worse, drive vast amounts of public dollars to subsidize what are ultimately still heavily-polluting fossil fuel-based projects, now just greenwashed as “clean.” Baseline counterfactuals.