The transportation sector accounts for 24% of global CO2 emissions according to the International Energy Agency (IEA) – and road vehicles account for almost three-quarters of that total. Despite the increase in the number of electric and hybrid cars on the road, the sheer volume of travel means that overall emissions for the sector continue to rise. The sector is heavily dependent on oil, although rail travel is an exception, with 39% of its fuel supplied by electricity.

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