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Description:The number of people in the world is the balance between reproduction and mortality. Reproduction per person is affected by the product of economic assets per person and the number of people, where economic assets are evaluated in emergy units which includes environmental as well as urban assets. Mortality increases by deseases and decreases by economic assets used for health care. This model combines theses factors. |
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Variables:R = renewable resources remaining unusedF = nonrenewable resource reserves A = feedback inputs from economic assets N = feedback inputs from population Equations:F = -k0*R*F*N*AR = J/(1 + k1*F*N*A + k2*A) A = k3*R*F*N*A + k4*R*A - k5*A - k6*A - L0*N^2(1 - k9*A) - L0*N(1 - k9*A) N = L1(A/N)*N - k7*N(1 - k9*A) - k8*N^2(1 - k9*A) Simulation:The graph shows the changes of N(blue), F(green) and A(red) over a time period.Source code: people.java |
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"What if" Experiments: |