The Environmental Protection Agency on Monday took a major step toward restricting greenhouse gas emissions from airplanes.

The agency determined that the emissions from commercial aircraft engines cause pollution that is endangering public health and the environment. The “endangerment” finding is a major step toward the EPA developing greenhouse gas emissions standards for airplanes. According to the EPA, some aircraft engines release carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride. All of those gases are greenhouse gases, which many scientists blame for causing climate change and the subsequent warming of the globe.