According to the Norwegian government the carbondioxide levels (red graph, right side shows concentration) were zero, or close to zero Parts Per Million, until about year 1700. Since all plant life would collapse if the concentration falls below 150 ppm, how was life sustained on this planet before year 1900? Photosynthesis would be impossible...
Download and see for yourself, Chapter 9 page 117:
Corrections were made in february 2024 after discovering the too obvious falsification of data:
https://www.regjeringen.no/contentassets/20944f0c5bf14bd5b5112ae8aa08e853/no/rett/rettebrev-nou-2023-25.pdf
https://www.regjeringen.no/no/dokumenter/nou-2023-25/id3006059/?ch=3#kap9
https://www.regjeringen.no/no/dokumenter/nou-2023-25/id3006059/