Abstract:
:Although the transport sector is responsible for a large and growing share of global emissions affecting climate, its overall contribution has not been quantified. We provide a comprehensive analysis of radiative forcing from the road transport, shipping, aviation, and rail subsectors, using both past- and forward-looking perspectives. We find that, since preindustrial times, transport has contributed approximately 15% and 31% of the total man-made CO2 and O3 forcing, respectively. A forward-looking perspective shows that the current emissions from transport are responsible for approximately 16% of the integrated net forcing over 100 years from all current man-made emissions. The dominating contributor to positive forcing (warming) is CO2, followed by tropospheric O3. By subsector, road transport is the largest contributor to warming. The transport sector also exerts cooling through reduced methane lifetime and atmospheric aerosol effects. Shipping causes net cooling, except on future time scales of several centuries. Much of the forcing from transport comes from emissions not covered by the Kyoto Protocol.
journal_name
Proc Natl Acad Sci U S Aauthors
Fuglestvedt J,Berntsen T,Myhre G,Rypdal K,Skeie RBdoi
10.1073/pnas.0702958104subject
Has Abstractpub_date
2008-01-15 00:00:00pages
454-8issue
2eissn
0027-8424issn
1091-6490pii
0702958104journal_volume
105pub_type
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