Globally, transport-related emissions of CO2 are growing rapidly. The use of petroleum as a fossil fuel for transportation dominates CO2 emissions from this source. In 1999, in the USA, more than 30% of fossil fuel-related CO2 emissions were a direct result of transportation, with about two-thirds of this coming from petrol consumption by motor vehicles and the remainder coming from diesel and jet fuel use in lorries and aircraft, respectively.

In addition to a rapid increase in worldwide motor vehicle use, the widespread use of large-engined private cars has led to increased CO2 emissions in many countries, despite substantial increases in engine efficiencies. The falling price of national and international flights has also led to an explosion in air traffic in recent years, with air travel being one of the most greenhouse gasintensive forms of transport. Technological advances are continuing to increase efficiencies, but at the same time car, lorry and airplane use is escalating. The emission of greenhouse gas from transport is likely to be one of the most fiercely fought battlegrounds of environmental reform during this century.

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