The fossil record shows that CO2 levels only rise in natural ice ages. Otherwise CO2 is limited by photosynthesis. You burn the Fossil Fuels, and get more life on Earth – not more CO2 in the air – that is impossible.
But in 1986 a friend was doing a PhD in Global Warming: nuclear power was backing this impossible science, to distract from Chernobyl.
And every scientist had done high school biology, so was familiar with the carbon cycle. So was aware CO2 could not rise in a warm period.
The Jurassic had twice then level of CO2 in the air – except during the 3 natural ice-ages, when it rose to 4 times today's static 2 parts per million.
When I pointed this out in 2001, my PhD got ended by Sheffield University.
But rational people have got PhDs in Global Warming. And most worryingly, have gone on to teach and lecture students. When they are adept at nuclear funded science fiction.
Those PhDs must be rescinded, and people sacked. Along with people who have published spurious, biologically impossible data.