Recently, Congress has convened hearings around whether the U.S. Environmental Protection Agency (EPA) is able to use the Clean Air Act to limit emissions of greenhouse gases and other pollutants associated with climate change.
Under the Clean Air Act, the EPA is required to regulate emissions that are considered to be pollution and that "endanger public health and welfare."
The Union of Concerned Scientists has just released a Clean Air Act Ticker which calculates the benefits, in U.S. dollars, of the implementation of Clean Air Act regulations since 1970.