Answer Happy

Which statement is true about the role of CO2 as a cause of recent warming? Select one: Un LATE a. Although CO2 has been increasing, other greenhouse gases have not. b. All greenhouse gases began to increase in the last 200 years but don't yet exceed the levels between. past ice ages. c. Levels of CO2 and other greenhouse gases began to increase more rapidly about 200 years ago and are now higher than they have been in hundreds of thousands of years. d. Levels of CO2 and other greenhouse gases have been increasing steadily over thousands of years.
Which statement is true about the effect of CO2 in the atmosphere on climate? Select one: O a. Increased levels of CO2 in the atmosphere are correlated with increased temperature. Ob. In the past, changes in CO2 have been associated with large swings in Earth's climate. O c. All of the above. Od. The greenhouse effect explains why climate can be affected by CO2.