What does Al gore, author of An Inconvenient Truth, demonstrate about the level of atmosphere carbon dioxide levels?

a. Each year CO2 levels rises, then falls

b. Each year CO2 levels increase at faster rates

c. Each year CO2 levels decrease

Al Gore, in the Inconvenient Truth explained and demonstrated that each year the CO2 levels on earth increase at faster rates and that this is mostly due to the activities of man, especially from excessive burning of fossil fuels and the latter must be stopped in order to at least slow down this build-up.