Without the greenhouse effect, earth would be
a. too cold to support our current ecosystem
b. too warm to support our current ecosystem
c. too wet to support our current ecosystem
d. barren of all life

Examine the population chart of niger. based on this chart, niger is in the stage of thompson’s demographic transition. a. balance b. growth c. leveling d. replacement

Suppose you had to resolve the problems believed to be caused by distance decay in russia. what would you suggest?

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population