As of November 2007, the CO2 concentration in Earth’s atmosphere was about 0.0384% by volume, or 384 ppmv.
The OSHA, NIOSH, and ACGIH occupational exposure standards are 0.5% CO2 averaged over a 40 hour week, 3% average for a short-term (15 minute) exposure, and 4% as the maximum instantaneous limit considered immediately dangerous to life and health.
We need to keep an eye on atmospheric CO2, but at the moment it seems we’re not in immediate danger of any ill effects.
Look, I am not a big global warming alarmist. But there is a difference between questioning the alarmism of global warming, and making comments that Co2 isn’t dangerous because plants need it. Comments like that come from a complete lack of understanding on the issue.
Piercing alarmist sentiments with a single-fact arrow ping for you!
Yeah, but why do you think you can throw down facts in the middle of an argument?
The whole key to Global Warming is that it is an appeal to ‘emotion’, not reason.
;o)