*adjusted impact* |
Amount of *Impact* after it has been changed by human activity (typically *Consumption*) |

*Age* |
Median age of a *population*, in years |

*Birth Rate* |
Births per year as a fraction of the *population* |

*C* |
Average *Consumption* per person in a *group* |

*Capacity* |
Total amount of *ecological resources* available to, and used by, a *group* (see *Rtotal*) |

*Cap/p* |
*Capacity* per person |

*C-low* |
*Simulation* that reduces consumption at a roughly constant rate to offset external *Impact* |

*Consumption* |
Ecological footprint of *group* expressed in *ecological resources*(see *R*) |

*cum*, *cumulative* |
Sum of values for a variable as a function of another *variable* |

$ current |
U.S. dollars inflation adjusted for a given year |

*Death Rate* |
Deaths per year as a fraction of the *Population* |

*ecological footprint* |
Measure of ecological products and services used by humanity, typically expressed as a unit of land area |

*ecological resource* |
Unit of *ecological footprint* corresponding to an average person's annual basic needs |

*Efficiency, E* |
Variable affecting the distribution of *Population* in a *group* |

*epoch* |
Period of time corresponding to when part of a *group* is in a given *Phase*. |

*global variable* |
A *variable* that describes a charcteristic of interest for one or more *groups* |

*Green* |
The *simulation* that is the best match to historical values of *global variables* |

*group* |
A set of people with specific *Population*, *Consumption*, and *Capacity* |

*GWP* |
Gross World Product in U.S. dollars (2010 value unless otherwise indicated) |

*GWP/p* |
Average *GWP* per person in U.S. dollars (2010 value unless otherwise indicated) |

*Happiness, H* |
Life satisfaction of members of a *group* (on a scale from 0 to 1, typically expressed in %) |

*Impact*, *self-sustained impact* |
Change in *ecological resources* (typically a reduction) continually caused by a non-human source |

*Life Expectancy, L* |
Expected lifetime (in years) of a person or *group* born in a given year |

*Max Phase* |
The maximum phase in a *group* |

*Min Phase* |
The minimum phase in a *group* |

*mixed group* |
A *group* resulting from interaction of groups based on maximum *Weights* of *Population*, *C*, and *Capacity* |

*Needs* |
Maximum *ecological resources *consumed for basic survival |

*Normalized* |
Expressed as a fraction of a given value (such as the maximum expected value or value in a given year) |

*Normalized Population / Nature* |
*Sratio* / 1.126; also: *Sr* |

*P* |
*Cumulative* *population* as a function of a variable such as *phase* (*P* = *E*^*Phratio* - *E*). |

*Phase* |
Activity type; each phase is expressed as a fraction of its *Sr* range |

*Phase Ratio, Phratio* |
*Phratio* = (*Max Phase* - *Phase*) / (*Max Phase* - *Min Phase*) |

*Pmax* |
Maximum world population as a function of *Sratio* |

*Population* |
The number of people in a *group* |

*R* |
Total amount of *ecological resources *consumed by a *group* (*P* * *C*) |

*Rdiff* |
Amount of total *Wants* consumed by a given *group* |

*region* |
An arbitrary collection of resources and people (also *group*) |

*resource* |
*Ecological resource* |

*Rs* |
Amount of *ecological resources* remaining in a *region* or the world, usable by people and other species |

*Rtotal* |
*Capacity* |

*$Convert* |
Global inflation of U.S. dollars, as multiple of a value in 2010 |

*simulation* |
Set of mathematical projections of observable variables (typically* global variables*) that define a *universe* |

*Sr* |
*Normalized Population / Nature* |

*Sratio* |
Ratio of minimum *Consumption* by people (*Needs*) to remaining resources (*P* / *Rs*) |

*state* |
The combined characteristics of an entity (such a *group*) based on the values of a set of *global variables* |

*summed group* |
A *group* with the sums of interacting groups' *Population*, *Consumption*, and *Capacity* |

$T |
Trillion U.S. dollars |

*total consumption* |
The *Consumption* of everyone in a *group* |

*universe*, *world* |
Theoretical reality defined by a simulation, based on history in the real world |

*variable* |
A mathematical quantity whose value is based on the values of other quantities |

*Wants* |
Resources consumed for purposes other than needs (*R* - *Needs*) |

*Waste* |
Consumption in excess of half the total resources in the world (*R* - *Rtotal* */ 2*) |

*Wealth* |
Wealth in U.S. dollars (2010 value unless otherwise indicated) |

*Wealth/p* |
Average wealth per person in U.S. dollars (2010 value unless otherwise indicated) |

*Weight* |
Multiplier of a *variable* used to calculate the value of another variable |

*weighted group* |
A *group* resulting from groups interacting based on *Weights* of *Population*, *Consumption*, and *Capacity* |

*world group* |
All the people and *regions* in the world identified as one *group* |

*Year* |
Middle of given calendar year (A.C.E.) |