Quote:
Originally Posted by Poptech
Where do you get devasting levels from? Those are not even harmful.
- Carbon Dioxide (CO2) levels in the atmosphere have risen from 280 to 370 ppm over the past 100 years ( IPCC)
- Carbon Dioxide (CO2) is not toxic until 5% (50,000ppm) concentration ( Source)
- Any detrimental effects of Carbon Dioxide (CO2) including chronic exposure to 3% (30,000ppm) are reversible ( Source)
- OSHA, NIOSH, and ACGIH occupational exposure standards are 0.5% (5,000 ppm) Carbon Dioxide (CO2) ( Source)
You don't even feel drowsy until 10,000ppm. |
Poptech
Sorry I was not clear in my posting. The point I was hoping to make and failed, was to point out that in a book over 100 years old the CO2 levels described were higher than they are now reported to be for the same period. I was trying to be sarcastic (again failed) by pointing out the readings on the tops of mountains over 100 years ago was sometimes very high, so nothing new- 1110 ppm CO2, will I know get some posters very excited.