One way to improve energy efficiency is to offer tax credits for buying efficient houses.

A low-throughput economy is based on energy flow and matter recycling.

A key theme of thisCHAPTER is that we can make our economies and our societies more sustainable though the application of lessons learned by studying ____________________ .

Of all the motor vehicle fuels,the greatest polluter is hydrogen gas.

Which of the following is NOT true of city life compared to rural life? In a city: 

A)  infectious disease is less likely to spread. 
B)  air pollution is likely to exist at higher levels. 
C)  noise and light pollution are likely to be greater. 
D)  water pollution is likely to be more concentrated and more dangerous.

What happens to the sediments that are in and below the dewatered zone of an aquifer?

A) The sediments become compacted.
B) The sediments remain suspended.
C) The sediments move into the cone of depression.

CO₂ promotes the ______________________________ that warms the troposphere.

What kind of map gives detailed information regarding the elevation of the land's surface?

A) topographic
B) shaded relief
C) geologic
D) satellite image

Which of the following statements about streams is NOT true?

A) base level is the lowest elevation to which a stream can erode
B) a steep stream high above base level generally will be eroding its channel
C) some streams can simply transport material instead of eroding or depositing material
D) streams typically do not respond to a change in climate