Good work on the CO2 link butcherboy.
Snippet from: http://co2now.org/
Current level August:
388.15ppm
What level is safe?
The upper safety limit for atmospheric CO2 is 350 parts per million (ppm). Atmospheric CO2 levels have stayed higher than 350 ppm since early 1988.
breathable air becoming a diminishing resource, page-5
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