The U.S. Supreme Court on Monday placed further limits on the Environmental Protection Agency’s already-modest power to regulate power plant and factory emissions of greenhouse gases.

The Court ruled in a 2007 case that greenhouse gases emitted by new motor vehicles constitute pollution that is subject to regulation under the Clean Air Act. Under this act, any polluter that emits more than 250 tons of a recognized pollutant must acquire a permit before expanding or modernizing.

The EPA interpreted the 2007 ruling to mean that greenhouse gases emitted by stationary facilities—including power plants and factories—are also subject to regulation under the Clean Air Act. The agency raised the threshold for regulation of stationary facilities to 100,000 tons of carbon dioxide a year—a move it said was designed to avoid excessive permitting processes, given how prevalent CO2 pollution is.

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The Court’s ruling on Monday determined that, contrary to the EPA’s interpretation, the 2007 ruling on automobiles does not automatically trigger regulations for stationary greenhouse gas emitters. Furthermore, the court ruled that the EPA did not have the authority to rewrite this threshold without congressional approval.

As a result, the EPA cannot require stationary polluters to obtain permits solely on the basis of their production of carbon pollution. However, if a permit was already required for other pollutants, the EPA can force stationary polluters to employ certain technologies to control greenhouse gas emissions.

Yet, according to Bill Snape, senior counsel for the Center for Biological Diversity, these permits are themselves weak regulatory measures. “Most of the permits I looked at were very soft and relatively easy permits to comply with,” Snape told Common Dreams. “None of them had hard pollution standard triggers, and they weren’t forcing technological changes, just requiring that existing technology work as efficiently as possible.”