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With the CO2 Footprint learning tool you can view the projected atmospheric carbon dioxide concentrations over the next century and a half under various emission scenarios. Click 'Show Graph' to explore how atmospheric carbon dioxide concentrations change if we continue to emit current levels of carbon dioxide into the atmosphere.

Worked Example

Question: Asia contains much of the world's population and countries like China and India are developing quickly. If the carbon footprint per capita in Asia rises by just 0.1 tonnes per year, what will the atmospheric concentration of CO2 be in 2050? 2100? Open the CO2 Footprint Learning Tool and click on Asia. Change the CO2 emissions to grow linearly and enter 0.1 in the white box. Now click 'Run Model' and observe the graph of projected CO2 emissions by clicking 'Show Graph'. Use the 'Evaluate Single Point Tool' located in the top left hand corner of the graph to find the projected atmospheric concentration of CO2 in the years that you are interested in.

What is the projected atmospheric CO2 concentration in 2050?
If Asia's CO2 emissions increase by 0.1 tonnes every year, the concentration of atmospheric CO2 will be about 681 ppm in 2050.
What is the projected atmospheric CO2 concentration in 2100?
If Asia's CO2 output increases by 0.1 tonnes per year, the concentration of atmospheric CO2 will be about 908 ppm in 2100.
Your Turn

Question: The countries in North America, primarily the United States and Canada, emit the most CO2 per capita. What would the atmospheric carbon dioxide concentration be in 2100 if every continent emitted as much CO2 per capita as North America? This can be done by applying North America's CO2 output to all continents. On the other hand, what is the projected atmospheric carbon dioxide concentration in 2100 if North America decreases its output per capita from 19.9 to 10 tonnes of carbon per year? Remember to reset the learning tool before adjusting North America's CO2 output.