Depends on the temperature target: To keep global temperature rise below 2 degrees C, carbon-equivalent atmospheric concentrations must be kept below 450 ppm - which can be achieved by reducing emissions by 25-40% by 2020. The latter range is in the 2007 IPCC report and was the policy target advocated officially by the European Unionat the Bali conference. This was a subject of intense negotiations. No one else in the industrialized camp supported the EU on this. As a result, the Bali text only contains a footnote that indirectly refers to the IPCC-endorsed target, without actually containing the 25-40 numbers. Radoslav S. Dimitrov, Ph.D. Associate Professor Department of Political Science University of Western Ontario Social Science Centre London, Ontario Canada N6A 5C2 Tel. +1(519) 661-2111 ext. 85023 Fax +1(519) 661-3904 Email: [email protected]
On 2012-08-05, at 1:27 PM, VanDeveer, Stacy wrote: > Hi all, > I got a question from a summer school student, and I am trying to find the > ‘consensus’ answer in IPCC documents and I seem to be finding different > numbers. So here is the question: The IPCC estimates that global emissions > must fall by how much, to stabilize the climate systems during this century. > Are the best estimates from the 2007 report (which gives quite large ranges > for each of four warming scenarios)?? > > > > > > > > Stacy D. VanDeveer > Associate Professor > University of New Hampshire > Dept. of Political Science > Horton SSC > Durham, NH 03824 USA > [email protected] > tel: > fax: > mobile: > Skype ID: > (+1) 603-862-0167 > (+1) 603-862-0178 > (+1) 781-321-5880 > stacy.d.vandeveer > > Want to always have my latest info? > Want a signature like this? > > > > <image001.jpg> > > >
