*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 a *group* expressed in *ecological resources* |

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

*$ current* |
Monetary value (in U.S. dollars) of something in 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* |

*Emissions* |
Amount of carbon dioxide equivalent greenhouse gas emitted by humans per year in megatonnes |

*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 *before COVID-19 pandemic |

*Green"* |
The *simulation* that is the best match to historical values of *global variables *during COVID-19 pandemic |

*Group* |
A set of people and their environment 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* |
Amount of reduction of total ecological resources (*Capacity)* by a non-human source that is triggered by human activity. |

*Inflation* |
Ratio of monetary value of something in one year to its monetary value in another year |

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

*Longevity* |
The amount of time until a group consumes its *habitat* at the current rate. |

*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*, *consumption*, 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 individuals (typically people) in a *group* |

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

*R* |
Total amount of *ecological resources *consumed by a *group* |

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

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

*Resource* |
*Ecological resource* |

*Rs, Habitat* |
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 *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* |
*Consumption* of everyone in a *group* |

*Temperature* |
Mean annual global atmospheric temperature anomaly (difference from 1810) in degrees Celsius |

*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, Waste* |
Resources consumed for purposes other than needs |

*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.) |