Whether the trails are naturally occurring or contain additives such as aluminum as suggested by some, I have watched clear blue skies turn hazy with the sun being blocked as a direct result of the trails being laid by planes, as have my others around the world who have also documented this. Research into Geoengineering has been ongoing for decades and a researchers are on record as saying the apparatus and methods to conduct a world wide programme are available and the cost would run into the low billions of dollars. I'm aware that just because something is possible it doesn't mean it is happening but all I know is that I'm old enough to remember (only just) when the skies were deep blue and not full of plane trails.
Whether the trails are naturally occurring or contain additives such as aluminum as suggested by some, I have watched clear blue skies turn hazy with the sun being blocked as a direct result of the trails being laid by planes, as have my others around the world who have also documented this. Research into Geoengineering has been ongoing for decades and a researchers are on record as saying the apparatus and methods to conduct a world wide programme are available and the cost would run into the low billions of dollars. I'm aware that just because something is possible it doesn't mean it is happening but all I know is that I'm old enough to remember (only just) when the skies were deep blue and not full of plane trails.