re: #64 Merkin

“There is no danger to humans at this level - the CO2 levels in submarines may reach 8,000 ppm without problems for humans, and our exhaled breath has about 40,000 ppm of CO2.”

Let see 380 ppm in atmophere, subs may reach 8000 so that is 21 times our atmospheric level. If we burn all the oil and natural gas we know of we cannot get to 700 ppm so what is your point.