Experts estimate that the current atmospheric concentration of carbon dioxide is how much higher than it was 250 years ago?
A)7 percent
B)12 percent
C)35 percent
D)42 percent

Question

Quizplus · Accepted Answer

The atmospheric concentration of carbon dioxide was about 280 parts per million (ppm) 250 years ago. As of 2021, the atmospheric concentration of carbon dioxide is about 419 ppm. This represents an increase of roughly 49 percent from the pre-industrial levels, which is approximately 42 percent higher. Thus, the best choice is D.

Experts Estimate That the Current Atmospheric Concentration of Carbon Dioxide