(from the larger project of an introductory approach to Ecological macroeconomics)
Part I described the economy as a physical process with a social structure that coordinates the operation of the physical structure.
Part II introduced some of the basic tools for measuring the economy (NIPA, inflation, unemployment) as well as the conceptual tools of supply and demand on the micro level and aggregate supply and aggregate demand on the macro level.
Part III ties all that together to create an explanation of how growth happens over the long run.
Video is here.