In 2002 transport produced 22% of all CO2 emissions, with industry and buildings producing 36% and power generation 42%. A wedge would be provided by improving fuel efficiency from an expected 30 miles per gallon in 2055, from its present value of just over 20 to 60 miles per gallon, or by reducing the average annual mileage from 10 000 to 5000 miles. Another efficiency wedge could be provided by building more energy-efficient buildings. For
Fig. 11.4 Predicted and proposed carbon emissions using stabilization wedges. Future CO2 levels and temperature rises based on simple linear model (see text).
11.6 STABILIZATION WEDGES FOR LIMITING C02 EMISSIONS
example, installing compact fluorescent instead of filament bulbs could provide a quarter of a wedge.