(a)   is the idea that Earth is essentially a closed system and cannot dispose of its waste or take on new supplies.

(a)   involved a shift from energy sources such as animals and running water to fossil fuels such as coal and oil.

condition in which human needs are met in such a way that a human population can survive indefinitely.

(a)  

any natural materials that are used by humans, such as water, petroleum, minerals, forests, and animals.

(a)  

calculations that show the productive area of Earth needed to support one person in a particular country.

(a)  

undesirable change in the natural environment that is caused by the introduction of substances that are harmful to living organisms or by excessive wastes, heat, noise, or radiation

(a)  

variety of organisms in a given area, the genetic variation within a population, the variety of species in a community, or the variety of communities in an ecosystem.

(a)  

resources that can be replaced relatively quickly by natural processes. (i.e wind, water)

(a)  

raising of crops and livestock for food or for other products that are useful to humans.

(a)  

resources that form much slower than they are consumed. (i.e. fossil fuels)

(a)