If you would have read my posts on Geoengineering then you'd know that such a cloud might just be a consequence of some geoengineering experiment, experiments carried out all over the planet. I sifted through quite some patents. Some company located in England that offers wedding weather for ca. 150.000 L or something. I actually haven't finished my series because of a threat that if I want to live my life the way I do, then I stop, and when I didn't stop immediately I've cut my thumb in a very weird accident doing something I did many times already. So some texts still lay unpublished.