The principle of common but differentiated responsibilities thus seems to be gradually releasing its grip in the climate regime. Most scientific evaluations state that if we intend to keep the temperature rise below two degrees above pre-industrial levels, global emissions should be at their highest in 2015 decreasing steadily thereafter with the legal treaty entering into force as late as 2020. In the most recent 2007 Inter-Governmental Panel assessment on Climate Change, both Polar Regions were deemed to be experiencing the ongoing impacts of climate change (as they were in the 2001 IPPC Assessment). The impacts on the Arctic are, however, much more pronounced.