GRG 305 Study Guide - Midterm Guide: Introduced Species, Axis Mundi, Urban Heat Island
Document Summary
Today, just over half- 54%- of human beings live in cities. By the year 2050 the un estimates that this figure will stand at. Some regions contain lots of cities, while others contain relatively few; the size, population density, and look/feel of those cities can vary greatly. Urbanized population: the proportion of a country"s population living in cities. According to the un estimates, almost all the worldwide population growth in the next several decades will be concentrated in urban areas, with cities of the less developed regions accounting for most of the increase. Agricultural surplus: the amount of food grown by a society that exceeds the demand of its population: models for the rise of cities. One way to understand the transition from village to city life is to model the development of urban life assuming that a single factor is the trigger behind the transition. Hydraulic civilization: a civilization based on large-scale irrigation.
