I used to refer to LLNL sankey diagrams all the time: https://flowcharts.llnl.gov https://flowcharts.llnl.gov -- really good work. There is also the global mod

I used to refer to LLNL sankey diagrams all the time: https://flowcharts.llnl.gov https://flowcharts.llnl.gov -- really good work. There is also the global model from the IEA: http://www.iea.org/etp/explore/ http://www.iea.org/etp/explore/