Based on the data in the graph, what can be said about current carbon
dioxide levels?
A. They are far higher than the highest natural levels.
B. They are at the high point of a natural, repeating cycle.
C. They are no different from levels in the past.
D. They are much lower than normal.
4
![Based on the data in the graph what can be said about current carbon dioxide levels A They are far higher than the highest natural levels B They are at the high class=](https://us-static.z-dn.net/files/dba/790bf5a6864d7a7e2f1a986968ba722d.png)