The Supreme Court just made it much harder for the U.S. government to respond to climate change in a 6-3 decision in the case of West Virginia v. EPA.

The Thursday decision, written by Chief Justice John Roberts and joined by the other five conservative justices, preemptively strikes down any regulations the Biden administration might consider issuing under a provision of the Clean Air Act to limit carbon emissions at power plants.

The court ruled that EPA regulations aimed at reducing carbon emissions under a specific provision of the 1970 Clean Air Act are not permissible because Congress did not specifically authorize the EPA to regulate carbon emissions.

According to the court, the EPA’s regulation of power plant emissions amounts to a large enough new regulatory proposal targeting a large enough segment of the economy to require specific congressional authorization.