The Obama administration's 2015 Clean Power Plan, which aimed to reduce carbon emissions from power plants, The US Supreme Court overturned. The Trump administration's much-criticized replacement, the Affordable Clean Energy Rule, derided as "a tortured series of misreads" of the US Clean Air Act, was also rejected by a federal court. But the Biden administration's Environmental Protection Agency is back at bat with a new proposed rule to control carbon dioxide in fossil fuel power plants, which is responsible for about a quarter of greenhouse gas emissions in the USA. The EPA says its new rule, issued Thursday, is based on "cost-effective and affordable control technologies" and will prevent up to 617 million metric tons of CO2 emissions by 2042, the equivalent of reducing the annual emissions of 137 million passenger vehicles. (Robert Zullo, New Jersey Monitor)