[Lokibob]

Not really a bogus subject, but it affects us very little.

As the article said, the days after 9-11 were warmer, documented. I doubt it was that significant, tho. You could make the argument to keep cities from expanding (heat island) or a farmer from plowing his field.

Contrail formation is a function of temperature, pressure, and the amount of moisture in the jet fuel. As the temp gets colder, and the pressure is less (high altitude) the air can hold less moisture. A jet flys high enough, the water in the fuel condenses into a visible cloud because the relative humidity approaches 100%.

Programs exist today that can predict contrail formation. Do a google search using the term "skewt logp".

A simpler approach is to reduce the amount of moisture in jet fuel, IMHO.

In Fairbanks Alaska, when the temperature reaches 50 below, the automobiles create contrails, however, they call it ice fog, since it is on the ground.

[Yo-Yo]

A simpler approach is to reduce the amount of moisture in jet fuel, IMHO.

OK, I admit to only freshman level college chemistry, but I thought that the two byproducts of the perfect combustion of a hydrocarbon fuel was carbon dioxide and water. Something like:

H_xC_x + O₂ = CO₂ + H₂O

I thought it was imperfect combustion that also created CO and NO_x and other pollutants. So how does one reduce the amount of moisture in the fuel when the water is a product of efficient combustion?