World 4 for editing
Can World3 be simplified? This is a model of the global human ecology. Closed systems are defined for carbon and land. An open system is defined for non-renewable non-fossil fuels in which the sink is external.  Energy is modeled as an open system with inflow from converters and outflow to various energy-driven human activities.
Model is in template form. Units are Tonnes (carbon or mineral (copper) ), Tonnes per Year, Hectares, Hectares per Year. 
Ready for input of real world values.  --CB 24Feb16
We have started putting real world data into the model.  Fill in stocks and flows by March 11. Be sure to cite the source of the data in the Notes section. --CB 5mar2016

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