https://grist.org/article/humans-didnt-exist-the-last-time-there-was-this-much-co2-in-the-air/
"Carbon dioxide is now more than 100 ppm higher than any direct measurements from Antarctic ice cores over the past 800,000 years, and probably significantly higher than anything the planet has experienced for at least 15 million years. That includes eras when Earth was largely ice-free."