In this activity, students will use several web tools to analyze CO2 concentrations from sites around the globe, measured by NOAA. By analyzing short and long-term trends of CO2 in the atmosphere, students will learn how the atmosphere and climate are changing and determine the causes that are responsible for these changes. The resource, "Student Activity on the Carbon Cycle" included in "Lesson 1 Sources of Atmospheric Carbon" is a part of "Unit 02 Atmospheric Carbon" included in Energy & Sustainability ES - Course 4