Abstract
Abstract Aviation exerts effects on climate change through CO 2 emissions and its non‐CO 2 emissions and effects. The most up to date aviation kerosene sales from International Energy Agency data were 241.3 Tg in 2007, that is, 761 Tg of CO 2 . The latest global CO 2 emissions data from the US Carbon Dioxide Information Center for all sources (fossil fuel, cement manufacturing, and gas flaring) indicate emissions of 30 177 Tg CO 2 in 2006, such that aviation represented 2.5% of these emissions in 2006. Long‐term average global air traffic in revenue passenger kilometres (RPK) and its CO 2 emissions have steadily increased since 1970 to 2007 at 6.25% and 2.74% per year. The current global economic crises affected aviation in the second half of 2008 such that traffic only increased by 1.3% from 2007 to 2008 (contrasting with 7.3% RPK from 2006 to 2007). Recently developed aviation emissions scenarios to 2050 imply increase over 2000 emission rates by factors ranging between 2 and 3.6.
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