carbon di oxide in atmosphere
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the concentration of carbon di oxide in the atmosphere of earth
has reached the dangerous mark of 400 ppm ( part per million)
during the month of may 2013 ( exactly on may 9).
the safer limit is only 350 ppm.
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the concentration of carbon di oxide in the atmosphere of earth
has reached the dangerous mark of 400 ppm ( part per million)
during the month of may 2013 ( exactly on may 9).
the safer limit is only 350 ppm.
கருத்துகள் இல்லை:
கருத்துரையிடுக