| http://www.w3.org/ns/prov#value | - co2 is life giving, in the sense that plants consume it, and we eat plants, or the things that eat plants. and yes, in the past (the waay, waaaaaay past) co2 levels were considerably higher than they are now. but, BUT, co2 is a poison to us. at present, co2 content is measured in parts per million, somewhere around 400 ppm i think. a fraction of a percentage. fun fact; when co2 reaches 6% of the a
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