U.S. Supreme Court justices have debated putting new limits on the Environmental Protection Agency’s power to tackle greenhouse-gas emissions, as they considered a case that threatens to undercut U.S. President Joe Biden’s climate agenda.

Hearing two hours of arguments in Washington, the justices gave a mixed reception to Republican-led states and coal companies seeking to bar the EPA from issuing a sweeping plan to reduce carbon emissions from power plants. The Biden administration is defending the agency’s authority, with backing from power companies and environmental groups.

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