People & Environment Interaction
Quick practice
Question 1 of 5
The Kigali Amendment (2016) to the Montreal Protocol extended its scope to phase down which class of substances, and what is its projected climate benefit?
Nitrogen trifluoride (NF₃)—industrial etching gas used in semiconductor manufacturing; no projected climate benefit confirmed
Hydrofluorocarbons (HFCs)—ozone-depleting refrigerants that replaced CFCs; projected to avoid 0.5°C of global warming by 2100
Perfluorocarbons (PFCs)—aluminium smelting byproducts; projected to reduce stratospheric ozone loss by 90% by 2050
Sulphur hexafluoride (SF₆)—electrical insulating gas; projected to eliminate all remaining ozone depletion by 2035
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