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Abstract. In the Arctic, even a slight shift in temperature, raising averages to above freezing, can bring about rapid and dramatic changes in an ecosystem that is defined by being frozen. Various threshold levels of global warming (e.g. 1.5, 2, 3, 4°C) have been used to examine what constitutes dangerous climate change. And based on the resulting impacts literature some governments and non-governmental organizations have stated their clear political support for keeping the global-mean temperature increase to less than 2°C above pre-industrial levels. In this paper we have examined the bio-physical changes in the Arctic associated with a global temperature increase of 2°C over pre-industrial levels in order to understand some of the regional implications of dangerous climate change.