The US Senate voted Wednesday to join more than 130 nations in pledging to phase out the use of super-polluting greenhouse gases found in refrigerators and air conditioners, a step that is expected to avoid as many greenhouse gas emissions as the entire planet emits every two years. By a vote of 69 to 27, the Senate ratified the 2016 Kigali amendment to the Montreal Protocol . Two-thirds of the senators present were required to vote yes for ratification. US Special Presidential Envoy for Climate John Kerry called the vote “a profound victory ​for the climate and the American economy.” The Montreal treaty was adopted in the 1980s to protect the ozone layer . The Kigali amendment expands on it by winding down the the production and consumption of hydrofluorocarbons, or HFCs, by 85% over 15 years. A group of chemicals […]