by Dave Clark and Stephanie Aglietti KIGALI, Rwanda | AFP | — In a major step toward curbing global warming, the world community agreed on Saturday to phase out a category of dangerous greenhouse gases widely used in refrigerators and air conditioners. Nearly 200 countries agreed to end production and consumption of so-called hydrofluorocarbons (HFCs) under an amendment to the 1987 Montreal Protocol on protecting the ozone layer. HFCs stoke climate change because they […]