The mostly Democratic-led states say that the E.P.A. acted unlawfully when it erased Biden-era limits on carbon dioxide from coal- and gas-fired plants.
President Trump has pushed to dismantle many federal policies that aim to tackle climate change, including Biden-era rules that limited planet-warming emissions from power plants.
The Democratic candidate for governor backed restrictions on disposal of fracking wastewater around a hard-hit town, and called for a “thorough investigation” of the dangers.
Ohio has become a destination for the underground disposal of fracking wastewater, much of it from nearby Pennsylvania. In Ohio, it is damaging some natural-gas wells.
The state is considering extending the life of its last nuclear power plant, Diablo Canyon, and allowing construction of new reactors to help meet its clean energy goals.
Established nuclear plants like Diablo Canyon in California tend to produce relatively affordable power.
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