For which of the following environmental pollutions would we expect that an inverted-U relationship would exist between environmental harm and per capita income?

The definition of a model is a:

a. description of all variables affecting a situation. b. positive analysis of all variables affecting an event. c. simplified description of reality to understand and predict an economic event. d. data adjusted for rational action.

The demographic transition view of population and growth in DVCs is that:

A. The most important factor affecting population growth in DVCs are demographic changes among the elderly B. Slower population growth is neither desirable nor productive for DVCs given the state of the economies in these nations C. Reduced birthrates must come first in DVCs, and then higher per capita incomes will follow D. Higher per capita incomes must come first in DVCs, and then reduced birth rates will follow