The potent greenhouse gases (also called the "F-gases") are on the list of greenhouse gases, covered by the Kyoto Protocol. The emission of potent greenhouse gases in the Nordic countries corresponds to 4.32 million tonnes of CO2 equivalents on an annual basis. That corresponds to 1.55 % of the total emission of all greenhouse gases (in CO2-eq.) from the Nordic countries. The emission of PFCs and SF6 has declined since 1990. That is mainly due to reduced emissions in the production of aluminium and magnesium caused by the introduction of new technology in the aluminium industry and because the production of raw magnesium has ceased. The emission of HFCs has increased since 1990, and that is mainly because HFCs were introduced as substitutes for ozone depleting substances (CFCs and HCFCs). In the report it appears that a lot of development work is going on in the Nordic countries to develop and implement alternatives to HFC based products such as refrigeration systems and foam blowing. Also taxes and legislation have been introduced in some Nordic countries, and it might appear that the consumption and emission of HFCs will stabilize and perhaps decrease in the future.