In this activity, students will use global carbon dioxide CO 2 concentration data since 1930 to plot major life milestones of themselves, their parents, and grandparents along a curve. Students will learn about trends over time and the long-lived nature of CO 2 in the atmosphere, and discuss solutions to the problem. Materials Student Worksheet – Download PDF CO 2 concentration data – Download CSV (Optional) 1832 to 1958 data from Antarctic ice cores – Download data (Optional) NOAA's Global Mon