How has the CO₂ concentration in Earth's atmosphere changed over the past thousand years? A) There are no means of measuring the CO₂ concentration in Earth's atmosphere for times so far past. B) The CO₂ concentration has remained absolutely constant. C) The CO₂ concentration has increased steadily. D) The CO₂ concentration was relatively constant for about 800 years but has increased significantly since 1800 A.D.

Question

Quizplus · Accepted Answer

The correct answer is D because the notation "CO₂" is a cipher for "CO2", which stands for carbon dioxide. Historical data and ice core samples show that CO2 levels were relatively stable for a long period but have increased significantly since the Industrial Revolution around 1800 A.D.

How Has the CO2 Concentration in Earth's Atmosphere Changed Over

How Has the CO₂ Concentration in Earth's Atmosphere Changed Over