ACT Science Practice Questions - ACT Science Section (Enhanced ACT 2025) Exam

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Figure 2 shows two overlapping line graphs of atmospheric CO2 concentration (ppm) and average global surface temperature anomaly (°C) from 1960 to 2020. CO2 rises steadily from 317 ppm (1960) to 412 ppm (2020). Temperature anomaly rises from −0.1°C (1960) to +0.98°C (2020), with some year-to-year variability. Which of the following best describes the relationship between CO2 and temperature shown in Figure 2?

CO2 and temperature are inversely related over this period. CO2 and temperature both generally increase over this period. Temperature increased while CO2 remained stable. CO2 increased while temperature remained stable.

Correct Answer:

CO2 and temperature both generally increase over this period.

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