The US EPA announced that Canada and Mexico have joined the United States in proposing to expand the scope of the Montreal Protocol on Substances that Deplete the Ozone Layer to fight climate change. The proposal would phase down hydrofluorocarbons (HFCs), which are a significant and rapidly growing contributor to climate change. The U.S. Environmental Protection Agency (EPA) led the analysis in the proposal, which demonstrates environmental benefits equal to removing greenhouse gas emissions from 59 million passenger cars each year through 2020, and 420 million cars each year through 2050. Reducing HFCs would help slow climate change and curb potential public health impacts.