This model provides a breakdown of how oil, coal, and natural gas power generation contribute to levels of C02 in the atmosphere. The data used concern the U.S. only. To contrast carbon production with solar and wind production, the interactions of the application show that no contributions are made by non-carbon energy production. This might be challenged with respect the energy required to produce wind generators and solar cells, but the amount of energy required to produce the equipment is miniscule compared to the the ongoing burning different types fuels. The refineries shown in the application account for the production of fuel for automobiles, which are the largest single contributor of CO2.