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Transport currently accounts for 23% of energy-related carbon emissions--equivalent to 7.3 gigatons of CO2 globally in 2013—and, unfortunately, ranks among the fastest growing sources of such emissions.
If we’re serious about bucking the trend and reducing the environmental footprint of the sector, we first need to understand where transport emissions come from, and how they will evolve. If you take out the 1 GT of CO2 emissions released by the aviation and maritime industry for international transport, about 6 GT of transport emissions are classified as “domestically generated.” Today, the share of domestically generated emissions is split pretty much evenly between developed and developing countries: high-income OECD countries account for about 3 GT, while non-OECD countries are responsible for another 3 GT.
However, under a business-as-usual scenario, this breakdown is expected to change dramatically. Without bold action to make transport greener, emissions from emerging markets are poised to grow threefold by 2050, and would then make some 75% of the global total. Domestically generated emissions from OECD countries, in comparison, should rise by a more modest 17%.
The share of each mode in overall transport emissions also differs depending on which part of the world you’re looking at: while 2/3 of emissions in OECD countries are from cars, freight and particularly trucking is currently more important in the context of emerging markets. Trucks actually generate over 40% of transport emissions in China, India Latin America and Africa.