but instead it showed rising CO2 level lagging rising temperature with cause and effect the reverse of what they wanted.
used to be called q10 in biology and chemistry. increase the temp and increase the chemical activity. I wasn’t sleeping on that day in class.
Common sense?
The sun is the primary source of our heat. The temperature of the SUN as it hits the earth varies. There is speculation as to why and when it varies. Sometimes it is the sunspot, or a flare or one kind of ray vs another kind of ray.
And, of course for any given point on the earth it varies by season.