Global transportation emission trajectories

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If activity growth follows historical trends, global GHG emissions from the transportation sector will increase substantially from 2000 to 2030, despite the impacts of policies that have already been adopted to reduce those emissions. Policies in the pipeline—i.e., which have been proposed in some fashion but are not certain to be implemented—could reduce those emissions further, and an aggressive pursuit of policies that are feasible but have not yet been proposed could stabilize global transportation GHG emissions in 2030 at a level about 37 percent above 2000. But rapid progress toward those policies, coupled with a transformation of the transportation sector by new technologies and dramatic shifts in how people and freight move, will be required if the target of 50%–85% reduction in GHG emissions is to be met by 2050.

Source: Global transportation energy and climate roadmap