AnswersSC332 Environmental Science BClimate and Change in Ecosystems

Week 9: A History of Global Climate Change Answers

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1
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Greenhouse gases are best described as _______.

A
the result of fossil fuel use
B
gases that cause the greenhouse effect
C
carbon dioxide and methane
D
gases that trap energy from the sun in Earth’s atmosphere
2
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Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?

A
Pollution began reflecting sunlight and heat rather than absorbing it.
B
Evidence of global warming became overwhelming.
C
Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.
D
Congress required scientists to assign a cause to global climate change.
3

Human activities _______.

A
exacerbate the natural greenhouse effect
B
create the greenhouse effect
C
diminish the greenhouse effect
D
eliminate the greenhouse effect
4

Africa was covered by glaciers during the Pleistocene ice age.

A
T
B
F
5

“In a 2009 study, presented by the National Academy of Science, 97% of climate scientists agree that human activity is causing global warming." Which of the following statements is best supported by this study?

A
Most climate scientists dispute the theory of human influence on global warming.
B
Global warming is most likely alarmist propaganda based on false data.
C
Global warming is definitely not caused by human influence on nature.
D
Most climate scientists believe that there is evidence that explains global warming.
6

Global warming is a theory accepted by a majority of scientists.

A
T
B
F
7

Which of the following best describes the impact of glaciers upon the surface of the earth?

A
Ice buried continents under a few hundred feet of ice.
B
Glaciers scraped across the surface and altered landscapes and the course of rivers.
C
The passage of glaciers created new ecosystems.
D
All of the above.
8

Between 1940 and 1970 most scientists were already concerned about global warming.

A
T
B
F
9

Greenhouse gases are essential to support life on earth.

A
T
B
F
10

Which of the following is not a theory supporting global warming?

A
It is predicted that the average temperature will rise 1.4° C or more over the next 100 years.
B
Human activity has increased greenhouse gases.
C
Over the last 100 years the earth has warmed by 0.74° C
D
Carbon dioxide is an insignificant greenhouse gas.

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