The photos to the left of the blog are just some of the photos I have taken of contrails that don't disappear. Normal contrails fade away but these get bigger and bigger until the whole sky is a hazy overcast. I have taken heat from people on other blogs about what I have photographed and seen so I am asking, is there is anybody that is an expert on these that would like to shed some light on the subject? Why do some modern contrails disappear as they should and some grow to cover the sky? This hasn't always been the case. Why?
I should note that the picture to the right and above was not taken by me.