Question

question 7 of 34
the graph shows data from ice cores. what has happened to carbon dioxide levels over time?
a. they have skyrocketed.
b. they have gone up and down with no general trend.
c. they have remained steady.
d. they have plummeted.

Explanation:

By observing the graph, the atmospheric carbon - dioxide levels from around 1000 AD to 1800 AD were relatively stable around 280 ppm. After 1800 AD, there is a sharp increase in the levels, which is described as skyrocketing.

Answer:

A. They have skyrocketed.