The United States Senate has adopted an amendment to an international environmental treaty that would phase out the use of planet-warming greenhouse gases in a move hailed as a major step to confront the climate crisis.In a 69-27 vote on Wednesday, the Senate ratified the Kigali Amendment to the Montreal Protocol, pledging to end the use of hydrofluorocarbons (HFCs), commonly used in heating, ventilation, air conditioning and refrigeration.The Montreal Agreement, a 1987 global treaty, successfully pushed to end the use of substances that deplete the ozone layer.
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