Fluorinated gases (F-gases) are human-made chemicals containing fluorine, such as HFCs, SF₆, CFCs, and HCFCs. Although less prevalent and shorter-lived in the atmosphere than CO₂, they are highly potent greenhouse gases, some of which are thousands of times more harmful than carbon dioxide. F-gases are used in various applications, including refrigeration and air conditioning, foams and solvents, propellants for aerosols, and fire extinguishers.

Reducing the effects of F-gases on global warming includes management of leaks, recovery from old equipment for recycling or destruction, and replacing F-gases with less-harmful alternatives. These actions can be simulated using the "F-gases" slider in the advanced settings of the Waste and Leakage slider in En-ROADS. This slider also simulates the destruction of ozone-depleting substances (ODSs) like CFCs and HCFCs, which were phased out by the Montreal Protocol but still exist in uncertain amounts in stockpiles and equipment. For detailed controls, use the advanced sliders under Simulation > Assumptions > Energy > Methane, N₂O, and F-gases to adjust the maximum potential reduction through best practices, use of alternatives, and destruction, as well as the estimated amount of ODSs currently in existence.

The “F-Gas Emissions by Type” line and area graphs, located under Graphs > Greenhouse Gas Emissions, show the annual emissions of HFCs, PFCs, SF₆, and ODSs (labeled as “Montreal gases”) in your scenario:

The Kigali Amendment to the Montreal Protocol specifies a cut in production and consumption of HFCs by more than 80% over the next 25 years. To simulate this in En-ROADS, select the "F-gas Emissions by Type" graph under Graphs > Greenhouse Gas Emissions, and test policies that bend the HFC curve as close to the dotted line for "HFC follows Kigali" as possible. This scenario is one way to do it:

1. Maximize the "F-gases" reduction under the Waste and Leakage slider. 

2. Set the "Years to achieve waste and leakage actions" to the minimum.  

3. Adjust the maximum potential reductions for best practices, alternatives, and destruction under Simulation > Assumptions > Energy > Methane, N₂O, and F-gases. 

Notice that achieving the Kigali Amendment without overshoot is not possible due to late implementation, and a complete phase-out takes several decades.