After Reading the Paragraph Below, Answer the Questions That Follow

question 23

Multiple Choice

After reading the paragraph below, answer the questions that follow.
The graph below shows records of temperature (light gray line) and CO₂ (dark gray line) over the past 1,000 years. CO₂ is recorded in parts per million (ppm) .

-Currently, atmospheric CO₂ levels are approximately 400 ppm. The annual mean growth rate in CO₂ is about 2 ppm/year. Assuming this trend continues, what would you predict the CO₂ level to be in 100 years?

• A)100 ppm
• B)200 ppm
• C)600 ppm
• D)1,000 ppm