Quote:
Originally Posted by MMM
It seems strange to me to call CO2 a "pollutant" as it is what all mammals breathe out naturally, and what all plant-life takes in naturally. When I think pollutant I am thinking of something which is harmful on it's own to life on Earth...things like carbon monoxide...
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well I'm no expert but in my opinion Co2 becomes pollutant when it starts been hazardous for any form of life.
for example in the big cities when it starts to cause respiratory problems.