He is making a clickbaity technically true statement that is avoiding answering the actual point.
4540±40 million years ago earth formed
3480 million years ago oldest bacteria fossils we found formed
239±6 million years ago dinosaur age started
66 million years ago dinosaurs went extinct due to Chicxulub asteroid impact
2 million years ago Proto-humans first formed from other apes
0.3 million years ago Actual Humans formed
If CO2 levels dip below 150 ppm all complex vegetation dies, resulting in all multi cellular life dying.
If CO2 goes above 4000 ppm humans start dying from CO2 poisoning.
CO2 has been steadily dropping over the years.
140 million years ago it was 2500 ppm and has been steadily dropping since.
We are about to enter a new ice age, one that would have probably caused CO2 to drop below 150 ppm and exterminated all multicellular life on earth.
Luckily, humans came along and raised CO2 levels. Probably saving complex life on earth in the process.
You get news articles like "CO2 is highest it has been in 2.7 million years"... the reason they don't use a round number is that this when it dropped at the current level.
Also, I would guess that the reason it actually went up is that we cleared out so many forests. instead of