Chemtrails - Is there a secret, large-scale atmospheric spraying program ?

Last update 30 May 2019

Documentary movie "Overcast" from 2016 about natural, artificial, and harmful atmospheric phenomena and geoengineering: https://www.overcast-the-movie.com

An open access paper published in 2016 in the journal Environmental Research Letters via doi 10.1088/1748-9326/11/8/084011:

Quantifying expert consensus against the existence of a secret, large-scale atmospheric spraying program, Christine Shearer et al., Environmental Research Letters 11 (2016) 084011: https://iopscience.iop.org/article/10.1088/1748-9326/11/8/084011