Clouds need three things. 1. water vapour 2. solid (e.g. pollution, dust, pollen…) 3. electrical charge (ionisation).
This is a complex issue. Yes climate and geoengineering is real. Yes ‘spraying’ is real. Yes contrails are real; well, maybe not so much today. I understand jet engines no longer have water injection. And yes planes produce an extraordinary amount of pollution which is a major factor. But some of the photos below of the cirrus and lenticular clouds may be natural. It is impossible to know from observation. Bottom line, there are people who want to use both natural and man-made phenomenon to modify the weather for their own malevolent purposes.
All photos are taken at Cust, Canterbury, New Zealand.1
See also the work of James Lee here:
Not Cust, but it could be. Photos and video.