Question
me:
1. What was the average CO2 concentration at the start of the study? How does that compare with
the CO2 Concentration in 2015? What might explain this change?
Answer
The average CO2 concentration at the start of the study was 280 parts per million (ppm). In 2015, the CO2 concentration was 400 ppm, an increase of 120 ppm. This change is likely due to increased emissions of CO2 from human activities such as burning fossil fuels.