I am 63 I remember how contrails used to look like, This will not convince me otherwise. More subterfuge and deception I suspect. They used to disperse very quickly, not anymore. But hey believe what ever that book tells you, I will believe my memory. Oh and in the 70's I lived on the MAIN flight path from London Heathrow to the USA, so I am sure the "evidence" you have bears no relation to reality.