Does all that CO2 which goes into the atmosphere have an effect, or no?
The Earth has had far more CO2 than 1000 ppm even and it supported animal life just fine.
Your statement is true, and totally irrelevant. In that era of higher CO2, the earth's temp was much higher, and while some animal life was supported, they lived in the sea where they were saved from the baking heat. Animals left the sea onto the land as the earth cooled.
But the question you fail to deal with is not whether the earth can support some animal life at higher temps. The question is, can earth support MAN and his activities that we have developed in order to innovate and progress as a society at 1000 ppm of CO2 today? That is the question.
Climate scientists are telling us the answer is NO. Our way of life will have to change, in inconvenient ways.
Throughout the Sun Belt, an extended heat wave is sending temperatures soaring into the triple digits and risking heat stress to crops. At the same time, breadbasket states in the Midwest are struggling to manage a drought that’s affecting some areas for a second year in a row. Nearly two-thirds of Kansas is in severe, extreme or exceptional drought, according to the U.S. Drought Monitor, and about half of Missouri and Nebraska are in the same rough shape.
“As long as we have irrigation, we can keep up,” said Jay Reiners, who runs a farm outside Hastings, Nebraska. But “irrigation is meant to supplement Mother Nature, not replace Mother Nature,” he said. “It makes me really nervous.”
https://www.nbcnews....-july-rcna93862
Our food supply is coming under stress from the heat. Whatever the temp was 500 million years ago has no bearing on what is happening today, unless you can explain that coherently.
Edited by Rich C, 29 July 2023 - 09:11 AM.