En-ROADS was built using the best available science and data, with sources such as the International Energy Agency (IEA), the United States Energy Information Administration (EIA), and the Intergovernmental Panel on Climate Change (IPCC). The En-ROADS simulator is driven by its own equations, not external datasets, and is calibrated against history and projections. Default values and bounds on economic, energy, and climate related dynamics have been determined from an extensive review of literature; all parameters and equations are available in the En-ROADS Reference Guide. For those interested, many parameters or assumptions that we make can be changed in the “Assumptions” view under the “Simulation” menu.