Chemtrails

I found a paper on the well-known phenomenon of chemtrails. The authors have scientifically verified the possibility of their existence by two surveys filled by 77 atmospheric scientists. The results are not so unexpected... here is the link for the brave-hearted wishing to read the study recently published in Environmental Research Letters
http://iopscience.iop.org/article/10.1088/1748-9326/11/8/084011