re: and over yours
"Regardless, it was no where near the scale of what has been the trend over the last 4 decades, where temperature gain has matched the steady increase of human produced carbon in the atmosphere."
The last 4 decades includes a significant cooling trend- and last decade is essentially a flat trend.
The US population in 1930 was 122,775,046, today's population is slightly over 300 million. It was warmer in 30's in the US than any temperature in last 4 decades.
Considering that it had been a few decades since we left a the time of Little Ice Age, the warming was of greater scale than current 4 decades.
It can be said with a high degree of confidence that CO2 was not a factor in causing the Little Ice Age, nor ending it.