ABSTRACT
The biosphere is made of systems that change as time passes. Both environmental systems and human systems can be described by the way they change. The way a system changes depends on the system's organization and on the kind of energy source that is available. The energy language diagrams are really mathematical statements. It uses symbols to represent quantities and relationships, which become mathematical statements by putting numbers on the symbols. A heat sink symbol is drawn in every system diagram to show that there is energy dissipated as depreciation in every process and storage, although calculation of heat dispersed is not included in most of the simulations. When the relationships in the model shown in the energy diagram are put into the computer as a program which is run, the resulting graph shows what happens with time. The program is written in BASIC language, which is available to load on most computers.
