The Clean200 is intended as the clean energy inverse of the Carbon Underground 200™. Where the Carbon Underground 200™ (which evolved from the seminal Carbon Tracker Initiative report, Unburnable Carbon: Are the World’s Financial Markets Carrying a Carbon Bubble?), ranks the largest publicly listed companies by the carbon intensity of their coal, oil, and gas reserves; the Clean200 ranks the largest publicly listed companies by their total clean energy revenues, with a few additional screens to help ensure the companies are indeed building the infrastructure and services needed for what Lester Brown and many others have called “The Great Energy Transition” in a just and equitable way.