[Virginia-American]

It is really all the contrails of high alititude airliners injecting water vapor at a critical altitude, where it accumulates and retains more heat for the earth...

There might be something to that. There's been many days when it would be cloudless except for contrails.

[Sundog]

There is a correlary to that one; I have observed NOAA photographs of the oceans where the exhaust plumes of ships become a very significant cause for haze over the oceans.

Having circumnavigated the globe on a ship, I can tell you that when we reached the Mediterranean, there never was an end to the haze over the ocean. Only around the equatorial Pacific ocean was it completely gone.