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 Carbon dioxide (CO 2) is an important heattrapping (greenhouse) gas, which is released through human activities such as deforestation and burning fossil fuels, as well as natural processes such as respiration and volcanic eruptions The first graph shows atmospheric CO 2 levels measured at Mauna Loa Observatory, Hawaii, in recent years, with average seasonal cycleThe Greenhouse Experiment Materials (For a class of 32) 8 sets of crayons or markers (1 per group) Tape for displaying created towns Scissors Butcher paper or end roll of newspaper Time Required 4560 minute period Standards Met S2, S3, S4, S7, G4, G5, L, LA5, LA12 Procedure Draw 8 very simple ecosystems with a mountainous area, small stream and larger river on roll ofMTCO2e definition These charts measure carbon emissions in metric tons of carbon dioxide equivalent (MTCO2e) This unit accounts for the emissions of all greenhouse gases converted into equivalent amounts of carbon dioxide Chart 1 06 vs 19 bar chart The chart depic