I took me a while to start taking people who were talking about these strange long lasting plane trails, serious. It wasn’t until I began to see the same strange trails over my own home that I started to research them. Condensation trails as we knew them are a simple phenomenon. Warm air hits cold air and when the warmth dissipates the condensation disappears. Much like your warm breath cause a cloud in front of your mouth of a cold morning.
These “persistent” trails don’t. The actually grow and widen causing strange lingering veils of cloud cover in the upper atmosphere. The trails can stay for hours and hours.
Here is a speech made by Rosalind Peterson for the United Nations about the dangers of unregulated Weather modification.