Abstract

Because of their ozone depleting potential the most important chlorofluorocarbons and halons have been subjected to international control by the Montreal Protocol. Generally these substances play also a significant role in the greenhouse effect. Also other existing ozone depleting substances have been brought into the discussion: alternative halocarbons, carbon tetrachloride and methylchloroform. This report evaluates the consequences of different policies with respect to these non-regulated products for climate change with the help of a developed halocarbon modelu. RIVM has developed the Integrated Model for the Assessment of the Greenhouse Effect (IMAGE). The new module adds these alternative halocarbons to carbon dioxide, methane, nitrous oxide, CFC-11 and CFC-12, which were already covered by IMAGE.