Question

During past $150$ years, the concentration of $C{O}_2$ has increased approximately from

• A. $200$ ppm to $300$ ppm
• B. $350$ ppm to $450$ ppm
• C. $280$ ppm to $370$ ppm
• D. $120$ ppm to $280$ ppm

Answer 1

The correct option is C $280$ ppm to $370$ ppm

During past 150 years, concentration of carbon dioxide has enormously increased from 280 ppm to about 370 ppm. This is because of more industrialization, increased emission of exhaust gases, combustion of fossil fuels, deforestation etc.

So, the correct answer is '280 ppm to 370 ppm'.