1. What does Al Gore, author of An Inconvenient Truth, demonstrate about the level of atmospheric carbon dioxide level? 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 increases at a faster rate. Over the past 50 years it has nearly doubled.
C. Each year, the CO2 level decreases. Over the past 50 years, it has steadily decreased.