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.
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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
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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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