Which of the following could be said about ecological footprints?
a. ecological footprints don't take into account resources needed to absorb and manage wastes.
b. exact ecological footprints are often difficult to calculate, but estimates can be useful in comparing populations.
c. the average ecological footprints for various countries are nearly identical.
d. ecological footprints can't be used to determine carrying capacity.

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

Most of the carbon on earth is stored in the form of