Arctic Climate Impact Assessment

The Arctic Climate Impact Assessment (ACIA) is a study describing the ongoing climate change in the Arctic and its consequences: rising temperatures, loss of sea ice, unprecedented melting of the Greenland ice sheet, and many impacts on ecosystems, animals, and people. The ACIA is the first comprehensively researched, fully referenced, and independently reviewed evaluation of Arctic climate change and its impacts for the region and for the world. The project was guided by the intergovernmental Arctic Council and the non-governmental International Arctic Science Committee. Three hundred scientists participated in the study over a span of three years.

The 140-page synthesis report Impacts of a Warming Arctic was released in November 2004, and the scientific report later in 2005.[1]

The ACIA Secretariat is located at the International Arctic Research Center at the University of Alaska Fairbanks.

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[edit] SRES scenarios and climate change initiatives

While some scenarios assume a more environmentally friendly world than others, none include any climate-specific initiatives, such as the Kyoto Protocol.[7]
[edit] Criticism

The SRES scenarios were criticised by Ian Castles, and David Henderson.[8][9][10] The core of their critique was the use of market exchange rates (MER) for international comparison, in lieu of the theoretically favoured PPP exchange rate which corrects for differences in purchasing power.[11] The IPCC rebutted this criticism[12][13][14]

The positions in the debate can be summarised as follows. Using MER, the SRES scenarios overstate income differences in past and present, and overestimate future economic growth in developing countries. This, Castles and Henderson argue, leads to an overestimate of future greenhouse gas emissions. The IPCC would have made climate change more dramatic than it is.


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The positions in the debate can be summarised as follows. Using MER, the SRES scenarios overstate income differences in past and present, and overestimate future economic growth in developing countries. This, Castles and Henderson argue, leads to an overestimate of future greenhouse gas emissions. The IPCC would have made climate change more dramatic than it is.








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