The Minister for Environment, Dr Vincent Biruta, pounds the gavel after nations agreed on the Kigali Amendment to the Montreal Protocol on the phasing down of hydrofluorocarbons (HFCs) in Kigali in October 2016. The Kigali Amendment entered into force on January 1, 2019, paving way for the world to reduce the powerful climate-warming gases by more than 80 per cent in the next 30 years. File.