LA Times: A week before world leaders will discuss how to slow the increase of dangerous gases in the atmosphere, the Obama administration announced that it has reached agreements with a range of major companies to voluntarily phase out a class of chemicals, used in refrigerators and air conditioners, and seen as contributors to global warming.
The chemicals, called hydrofluorocarbons or HFCs, became the popular alternative to the refrigerant, Freon, banned in the 1990s as a danger to the planet`s ozone...