Question

$C{O}_2$ content of atmosphere bas increased in the last 150 years from ________________.

• A. 25 to 35 ppm
• B. 270 to 340 ppm
• C. 0.027 to 0.34 ppm
• D. 0.2 to 0.3 ppm

Answer 1

The correct option is B 270 to 340 ppm

$C{O}_2$ cont. 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. So, the correct answer is '270 to 340 ppm'