Why Carbon Dioxide?
It’s hard to imagine a better leverage point than Carbon Dioxide to assume control over a society. I mean it is essential to the production of energy, it is essential to breathing. It is a point that if you demonize it and gain control over it you can control everything. That’s attractive to people.
Quote from Richard S Lindzen (Atmospheric Physicist, Professor of Meteorology, MIT.) He is also the lead author of the IPCC 3rd Assessment report.
Not that an Atmospheric Physicist would know anything about Carbon Dioxide and how it may affect the planet.

