Current CO2 famineCurrent CO2 levels in the Atmosphere 423 parts per million
For the last 550 million years we were as high 7000 parts per million
We are currnetly in a CO2 famine relative to the last 550 million years
In the last 20 thousand years we almost became extinct as the CO2 levels dipped to 180 parts per million.
130 parts per million would have meant extiinction of plants and eventually humans.
Photosynthesis requires CO2. A greener plant requires more CO2
We dont have enough fossil fuels to burn to bring the planet back to a normall level of about 2000 parts per million.