The contrails of planes release carbon, soot dust, sulphates into the atmosphere. They generate artificial clouds which accentuate global warming, the greenhouse effect and react on the ozone layer. But the worst is yet to come. Artificial clouds reflect sunlight back into space, reducing planetary synthetic activity by 20%. 20% less photosynthesis means 20% less food production. Fly or eat will be tomorrow's bet.

David J. Travis, Andrew M. Carleton et Ryan G. Lauritsen, « Regional Variations in U.S. Diurnal Temperature Range for the 11-14 September 2001 Aircraft Groundings: Evidence of Jet Contrail Influence on Climate », Journal of Climate, Boston, États-Unis, American Meteorological Society, vol. 17, no 5, mars 2004, p. 1123-1134