Ten Republican attorneys general yesterday asked a federal court to swiftly block President Biden from raising a key metric for greenhouse gases. In a motion for preliminary injunction, the red states urged the U.S. District Court for the Western District of Louisiana to prevent Biden’s interim social cost of carbon from taking effect across the federal government. Biden signed a Jan. 20 executive order that established an interagency working group tasked with recommending an interim social cost of carbon within 30 days—and a final social cost of carbon by January 2022. The working group in March endorsed raising the social cost of carbon to $51 per ton. A coalition of 12 other attorneys general launched a separate legal challenge to Biden’s interim social cost of carbon in March (E&E News PM, March 8).