The atmospheric concentration of carbon dioxide increased from 278 ppm in 1790 to 383 ppm in 2007. what is the approximate percent increase in carbon dioxide concentration from 1790 to 2007?
a. 38%b. 505c. 92%d. 105%e. 138%

A. 38%

Explanation:

Percentage increase in carbon dioxide concentration = (Increase in concentration of carbon dioxide/initial concentration)×100

P = (C₂-C₁/C₁)×100 Equation 1

Where P = percentage increase in the concentration of carbon dioxide from 1970 to 2007, C₁ = The atmospheric concentration of carbon dioxide in 1970, C₂ = The atmospheric concentration of carbon dioxide in 2007.

Given: C₁ = 278 ppm, C₂ = 383 ppm.

Substituting these values into equation 1

P = [(383-278)/278]×100

P = (105/278)×100

P = 37.7%

P ≈ 38%

Thus the approximate percentage increase in carbon dioxide concentration from 1790 to 2007 is 38%

The right option is A. 38%

when it's short and dry.