A) 25 to 35 ppm
B) 270 to 340 ppm
C) 0.027 to 0.34 ppm
D) 0.2 to 0.3 ppm
Correct Answer: B
Solution :
\[C{{O}_{2}}\]conc. was about 270 ppm in 1750 and 368 ppm in 2000. The rise has been due to large scale deforestation (for grazing land, cropland or urban estates), change in land use and large scale combustion of fossil fuels.
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