It's science. Land-based plants evolved when CO2 levels were much higher than today. [1] In fact levels have been steadily declining from 3000 ppm 150 million

It's science. Land-based plants evolved when CO2 levels were much higher than today. [1] In fact levels have been steadily declining from 3000 ppm 150 million years ago; the current, holocene rise is a relatively minor bump. [2] [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692178/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692178/ [2] http://caos.iisc.ernet.in/faculty/pghosh/content/Publications/19.pdf http://caos.iisc.ernet.in/faculty/pghosh/content/Publication...