A federal court on Wednesday blocked an attempt by Texas to delay the Environmental Protection Agency’s plans to impose carbon regulations in the state early next year.

The state of Texas is suing the EPA to prevent the agency from forcing it to issue greenhouse gas permits for the biggest polluters when national carbon rules take effect in early January.

Until there is a ruling on the case, Texas asked the U.S. Fifth Circuit Court of Appeals to block the EPA’s mandate that the state expand its pollution regulations to include greenhouse gases. The court denied the request.

The EPA issued a finding last year that carbon dioxide and other greenhouse gases endanger human health and welfare. Since then the agency has moved forward with developing rules under the Clean Air Act to limit emissions blamed for climate change.