Deforestation causes serious air pollution in the region mainly because a. land is often cleared by burning trees.

b. the destruction of forests threatens animal habitats.

c. trees are usually cleared to build more roadways.

d. the lumber industry uses gasoline-powered machinery.

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d

Explanation:

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d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]