How long a con trail lasts is simply based upon the atmosphere the aircraft is flying in. A contrail lasts much longer in cold, humid air. The temperatures at altitude, even on a nice warm day, can be sufficent to cause the contrail to freeze, thus lasting much much longer.
In the same way, on a warm, low humidity day you do not normally see car exhausts. But on a cold, humid day, you often do.
And both highly polluting Geli, even if they are not spraying anything.
The rumour about ‘chemtrails’ was probably started by the establishment.
While we concern ourselves with chemicals being sprayed which can easily be proved wrong, we are not dealing with the real problem of contaminating our upper atmosphere with the burning of thousands of tons of jet fuel. And what goes up, must come down.
Exactly & cars do as much damage to our atmosphere as aircraft & if anything cars, due to their numbers, cause as much, if not more damage. The height is immaterial, as fumes are in general lighter than air & thus rise. Which is why smog was an issue. It was caused by cold, moisture heavy atmosphere (weather.) Which kept the fumes low & caused more suffering to humans more quickly, more visably. In the same way contrails are more visable when conditions are cold & humid at that altitude.
