I don’t understand some things. In the early 1960’s, Sacramento summer high temperatures were in the 120f range. Today 55 years later, merely 106. Granted these were highs.
About CO2, in the end Permian mass extinction, the Siberian Traps (ten thousand square km of lava flows) raised atmospheric CO2 to 5% which is 50,000ppm. The temperature increase was 5 to 8 C. If 50,000 ppm produced 8C, how does 500 ppm create an increase of anything more than 0.08C?