I seem to remember the concentration of CO2 necessary for this to be 10-100 times higher than current. Also made worse on Venus by proximity to the Sun and coll

I seem to remember the concentration of CO2 necessary for this to be 10-100 times higher than current. Also made worse on Venus by proximity to the Sun and collapse of the planetary magnetic field. Essentially, the greater solar wind / radiation flux and holes in magnetosphere disrupts atmospheric H2O and H2 is blown off planet, and O2 oxidizes C next (which then falls into a feedback loop with CO2 and H20 vapor driven greenhouse effect) I'm extraordinarily concerned about global warming, but it's very likely humanity will kill itself well before it can create a runaway Venusian like greenhouse. I think the concentration of CO2 alone is fatal to human life well before that level. edit: quick cites https://www.scientificamerican.com/article/fact-or-fiction-runaway-greenhouse/ https://www.scientificamerican.com/article/fact-or-fiction-r... (30k ppm CO2, disputed), https://www.dhs.wisconsin.gov/chemical/carbondioxide.htm https://www.dhs.wisconsin.gov/chemical/carbondioxide.htm (5k ppm CO2 upper limit for workplace exposure)