On: Eliminating contrails from flying could be cheap

[like_any_other]

To be fair, most gasses and even aerosols are effectively invisible to the naked eye. Not to mention viruses, prions, bacteria, spores.. some of which affect behavior (rabies, mad cow disease, and the famed cordyceps for ants).

[lukan → like_any_other]

Yes, but I experienced those nuances are lost on people, who think smoke is just water vapor otherwise.

And if planes are making visible clouds one day and the other not, it is obviously because they are not spraying all the time, etc.

So no more clouds would not make people smarter, but it might actually reduce this particular conspiracy spread.