C-Learn Intro Video

When you enter the C-Learn Simulator home page, the standard settings are for the "Business as Usual" scenario. This scenario corresponds to the IPCC A1FI. If at any time you wish to return to these settings you may press the "Reset Inputs" link near the bottom of the simulator screen.

Changing the inputs and running a new scenario is easy. To view a variable definition or an explanation of the values of a variable, click on the name of the variable or its info button.

The short version of instructions: change year and % reduction values, hit "run", explore graphs, explore/copy data (right click or control click on the graph to copy it), read explanations, and copy/paste graphs into your own presentations to share with others.

And, the longer version:

Creating a "What if" test

To adjust the values of one of the variables for another simulation, change the number in the text box (or move the blue button on the slider, where appplicable). Your may use the tab key to move from one data entry box to the next. To see the definition of a variable, click on the variable name or info button. Below is a guide to definitions of the variables and what the basic settings mean.

Hit "Run Simulation" to generate model output using your new settings - there will be a short delay while the equations are calculated on the Forio server and the results are returned to you in graph and data form.

Understanding Input "Levers"

Fossil Fuel Emissions by Country Group is the future fossil fuel emissions based on a Stop Growth Year and a % Annual Reduction that begins in the Reduction Start Year

Developed Countries are many of the most developed nations. US, EU (27 countries) plus Norway and Sweden, Russia and former Soviet States, Japan, Canada, South Korea, New Zealand and Australia.

Developed Countries United States (US)
Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxemburg, Malta, the Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom, Norway and Switzerland. (includes former Czechoslovakia)
Russia, Albania, Bulgaria, Hungary, Poland, Romania, Bosnia & Herzegovinia, Croatia, Macedonia, Slovenia, Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Russian Federation, Tajikistan, Turkmenistan, Ukraine, Uzbekistan (includes former Yugoslavia and USSR)
New Zealand
South Korea

Developing Countries A are many of the fastest developing and larger nations. China, India, South Africa, Mexico, Brazil, Indonesia, and other large developing Asian countries.

Developing Countries A China
Indonesia, Philippines, Thailand, Taiwan, Hong Kong, Malaysia, Pakistan, Singapore
South Africa

Developing Countries B are smaller developing countries in the Middle East, Latin America, Africa, and Asia.

Middle East Bahrain, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Qatar, South Arabia, Syria, Turkey, United Arab Emirates, Yemen, West Bank and Gaza (Occupied Territory)
Other Latin America Argentina, Chile, Colombia, Peru, Uruguay, Venezuela, Bolivia, Costa Rica, Cuba, Dominican Rep., Ecuador, El Salvador, Guatemala, Haïti, Honduras, Jamaica, Nicaragua, Panama, Paraguay, Puerto Rico, Trinidad and Tobago. and Caribbean Islands
Other Africa Algeria, Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Cape Verde, Central African Republic, Chad, Comoro Islands, Congo, Côte d'Ivoire, Djibouti, Equatorial Guinea, Eritrea and Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea Bissau, Kenya, Lesotho, Liberia, Libya, Madagascar, Malawi, Mali, Mauritania, Mauritius, Morocco, Mozambique, Namibia, Niger, Nigeria, Reunion, Rwanda, Sao Tome & Principe, Senegal, Seychelles, Sierra Leone, Somalia, Sudan, Swaziland, Tanzania, Togo, Tunisia, Uganda, Zaire, Zambia, Zimbabwe, Mayotte, Saint Helena, West Sahara
Other Small Asia Bangladesh, Burma, Nepal, Sri Lanka, Afghanistan, Cambodia, Laos, Mongolia, N. Korea, Vietnam, 23 Small East Asia nations

Emissions from Deforestation This value is a "0-1" index for future "land use" emissions starting in 2012, where a decrease in value reduces deforestation, thereby reducing CO2 land use emissions. A value of 1 yields constant emissions (5.4 GtonsCO2/year) through 2100, 0 eliminates deforestation by 2050, and 0.5 yields a drop of 50% by 2050, and remaining at that level until 2100. Regions with negative emissions will not experience a change, in which case the overall effect is slightly greater than the indicated change.

Sequestration from Afforestation is a "0-1" index for the annual removal of CO2 from the atmosphere due to the creation of new forests, starting in 2012. A value of 1 delivers the IPCC estimated maximum of 1.6 GtonsC/year; .5 delivers half of the maximum. Increase to remove more CO2 from the atmosphere by growing trees.

Goal for CO2 in the Atmosphere is your goal for CO2 concentration in the atmosphere. Shows up on right graph as a horizontal line. Many recommended goals range from 350 ppm to 450 ppm.


Reset inputs sets all of the slider selections to their original values and adds a run with BAU settings.

Clear runs removes all previously stored comparison runs and resets all of the slider selections to their original values.

Change scenario names allows users to name multiple scenarios for comparison on the graphs.

Choosing Your Own Scenario Name

Click on "Change scenario name(s)"

Name Runs

The simulator automatically names subsequent runs "Run 1", "Run 2", etc. On this page you can rename the runs to have your own names such as "Business as usual", "Everyone flattens", "Developed world reduces alone", or "all stop growth in 2020".

If a browser window is left open and inactive for over 15 minutes, select Clear Runs to start a new session.

Viewing Results in Graphs

The first results of your simulation appear as the graphs on the home page. On the left graphs are the emissions profiles resulting from the assumptions you have made for fossil fuel emissions from the three country groups and changes that you have made to Emissions from Deforestation and Sequestration from Afforestation.

Input Graphs

On these graphs you see a graphical representation of the emissions from 2000-2100 corresponding to the input settings. For example, if you chose a reduction in emissions for "Developed Countries", you should see the emissions graph line reflect that reduction.

On the right side of the window, you see the Impacts of your choices: Atmospheric CO2 concentration that would result from the emissions settings you made, and average Global Temperature increase as calculated by the C-Learn simulator.


You can see many other resulting graphs showing the behavior of other variables in your simulation run by clicking on graph areas in the navigation bar. Note that some graphs show just the results from the most recent simulation and some graphs are "comparative", showing multiple runs on the same graph.

Menu names and graphs that can be viewed:

Comparative graphs will include each of the runs you have made with the individual run names in the legend up to a total of five runs. When the sixth run is produced, the first run is eliminated. Each subsequent new run eliminates the oldest run.

Stacked graphs include the results form several related variables. The total of all the variables is therefore the top of the graph.

Viewing and Copying Results as Data

Data table

Near the far right end of the green navigation bar you can see the "Data" menu item. Here you can view the raw data from the scenario you have created.

By selecting from the graph list drop down, you can view the data for any of the graphs that are displayed. This can be especially helpful when, for example, you want to see the value for CO2 concentration in a specific year such as 2050 or 2100.

You can also copy and paste the data into your own spreadsheet software to make your own graphs.

Using Graphs to Make your Own Presentations and Reports

You can transfer your graphs to your own reports or presentations by dragging the graph to the desired document, copying/pasting, or right-clicking/control-clicking and choosing "Save Image as" or "Copy Image". Different browsers and operating systems will operate differently.

Notice that often when you copy a graph, the graph will not include the name of the y axis. You will need to add that information to the graph.

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