[RedEyeJack]

“we all know that CO2 isn’t required by the ecosystem for anything”...

Does anyone know how much CO2 in the atmosphere is too much? How much is too little? Where such measurements should occur and why?

The whole CO2 issue appears to be based on a sort of nature loving religion that Al Gore and others are worshipping as a matter of faith rather than the “established” science they claim.

[PeterPrinciple]

Does anyone know how much CO2 in the atmosphere is too much? How much is too little? Where such measurements should occur and why?

---

From my botany study days, plants are co2 starved. In fact some plants use a second more energy required method to capture the co2 they need.

[Paladin2]

4% seems to be a good upper bound (approx. concentration to ones exhalations).

[central_va]

i think the min for plant life is 180 ppm. The max was reached 250 million yrs ago at 2000 ppm. Currently it is 400ppm.