Question

question 4 of 29
the graph shows data from ice cores. what has happened to carbon dioxide levels?
atmospheric carbon dioxide from law dome ice cores
a. they have gone down significantly since 1900.
b. they have remained flat and steady since 1900.
c. they have gone up significantly since 1900.
d. they have gone up and down with no general trend.

Explanation:

By observing the graph, the atmospheric carbon - dioxide levels show a sharp upward trend starting around 1900.

Answer:

C. They have gone up significantly since 1900.