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Sir Geoffrey Johnson Smith
To ask the Secretary of State for the Environment what approximate calculations have been made of the relative importance of car and aircraft emissions in global warming.
Mr. Trippier
The total fuel consumption of road traffic compared with aircraft gives a good approximation to their relative importance in terms of global warming. World figures for 1986 show that aviation accounted for about 12 per cent. by weight of the combined consumption of motor fuel, jet fuel and aviation gasoline.