Question

According to the data shown in the SmartFigure, what is the natural range of atmospheric carbon dioxide concentration over the past 800,000 years?

a) 150-200 ppm
b) 250-300 ppm
c) 350-400 ppm
d) 450-500 ppm

Answer 1

The natural range of atmospheric CO2 concentration over the past 800,000 years was approximately 180-300 ppm, with the correct answer being b) 250-300 ppm.

Step-by-step explanation:

According to the data presented, the natural range of atmospheric carbon dioxide concentration over the past 800,000 years has fluctuated between approximately 180-300 parts per million (ppm).

This range was typical until there was a steep, unprecedented increase over the past 50 years.

The correct answer to the question is b) 250-300 ppm, which falls within the historically accurate range prior to the recent industrial increases in CO₂ levels.