Reducing or eliminating atmospheric pollution is at the heart of many anti-climate-change measures.
Hydrofluorocarbons (HFCs) are a class of greenhouse gases that contribute significantly to global warming.
While most people are aware of carbon dioxide and methane.
The United States has recently joined approximately 130 other countries to take a major step toward eliminating them.
According to some analysts, this is "the most important environmental deal that the United States has entered in at least a decade."
The movement to eradicate the highly powerful class of greenhouse gases, however, has a long and storied history spanning decades.