Who has the authority to order utilities to cut their carbon emissions? That's what the U.S. Supreme Court will hearing arguments about Tuesday, in a case that pits the Obama administration against environmentalists.
Environmentalists like the Audubon Society want courts to be able to order emissions reductions at plants in 20 states.
But the Obama administration is siding with utilities in urging the High Court to throw out the case. They say the Environmental Protection Agency, and not a federal court, has the power to make rules about climate change.
Only eight justices will hear the case, which means it could end up in a 4-4 tie.
Justice Sonia Sotomayor recused herself because she was on the federal appeals court that heard the case.
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