F2

Figure 2. Global carbon emissions from fossil fuel use, 1960-2010 and for the IIASA-WEC scenarios to 2100 (In GtCO2, data from http://www.iiasa.ac.at/cgi-bin/ecs/book_dyn/bookcnt.py). The potential savings in 2020 from all IT work (7.8 GtCO2) as estimated by the Smart 2020 group is shown by the vertical line.