Front

What proportion of the world’s CO2 emissions come from motor vehicles and industrial facilities in urban areas?

Back

Two-thirds.

Front

What is a characteristic of exurbs?

Back

They lack a socioeconomic center.

Front

What is the first phase of urbanization, as experienced in the United States?

Back

Migration from rural areas to large central cities.

Front

What is a trend in urban population dynamics?

Back

The proportion of the global population in urban areas is increasing.

Front

At what decibel level does permanent damage to the ears begin after prolonged exposure?

Back

85 decibels.

Front

What are the primary sources of CO2 emissions in urban areas?

Back

Motor vehicles and industrial facilities.

Front

Define 'urbanization'.

Back

The process by which an increasing percentage of a population lives in cities and suburbs.

Front

What is the difference between urban areas and exurbs?

Back

Urban areas are densely populated regions with economic and social centers, while exurbs are less densely populated areas that lack a central economic focus.

Front

What factors contribute to the trend of increasing urban populations?

Back

Economic opportunities, migration from rural areas, and improved living conditions.

Front

What is the significance of the 85 decibel threshold?

Back

It is the level of sound exposure that can lead to permanent hearing damage.