Atmosphere
The red line on graph below shows how levels of carbon dioxide in the Earth's atmosphere have changed through geologic time.
The values on the graph's y-axis are measured in parts per million (ppm).
Atmospheric Carbon Dioxide (ppm)
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
Early
Earth
ime
Which of the following statements about the information in the graph is most likely to be true?
Today