How bad is co2 and what about water vapor

CO2 is the biggest problem? Well, erm, no, I isn't.
Name name parts per million or billion effect per molecule

Water vapor (H2O) ppm 0 tot 30000 1
Carbon dioxide (CO2) ppm 0400 1
Methane (CH4) ppb 02 84 x
Nitrous oxide (N2O) ppb 01 298 x

For your reading pleasure.
https://www.nasa.gov/feature/goddard/2016/carbon-dioxide-fertilization-greening-earthhttps://phys.org/news/2011-03-co2-atmosphere.html

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