What does Al Gore, the author of an Inconvenient Truth, demonstrate about the level of atmospheric carbon dioxide levels.

Question

A. Each year, the CO2 level rises and then falls. Over the past 50 years it has steadily increased.
B.Each year, the CO2 level rises and then falls. Over the past 50 years it has Nearly doubled
C. Each year, the CO2 level rises and then falls. Over the past 50 years it has Steadily decreased

Answer 1

A. Each year, the CO2 level rises and then falls. Over the past 50 years it has steadily increased.