Air transport is essential for world business and tourism.
Over the last 25 years, the number of international tourists has more then doubled.
What is available mostly concerns earth-bound transport.
In the year 2000, there was in Europe enough factory capacity to make about 18 million cars a year (with only 15 million expected to be sold).
The same capacity was in the US (the market was expected to shrink to less than 17 million).
The IPCC figure is expected to grow to between 5 and 6% in 50 year's time.
In addition, the climate impact of flying is increased by a factor of at least 2.5 (compared to the combustion of jet fuel alone) by emission of nitrous oxides and other pollutants at high altitudes.
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