AnswersFL-2001340-Environmental Science Sem 2Global Change

A History of Global Climate Change Answers

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Why was the concern over global cooling replaced with a concern over global warming?

A
The science community needed a cause to frighten the general population.
B
Steady surface temperature increases were noted between the 1970’s and 90’s.
C
Air pollution only became a concern in the 1980’s.
D
Scientists observed severe ocean acidification.
2
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Between 1940 and 1970 most scientists were already concerned about global warming.

A
T
B
F
3

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.
4

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

A
T
B
F
5

Which of the following is not a manmade cause of global warming?

A
burning fossil fuels
B
deforestation
C
respiration
D
population growth
6

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.
7

Africa was covered by glaciers during the Pleistocene ice age.

A
T
B
F
8

Greenhouse gases are essential to support life on earth.

A
T
B
F
9

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.
10

“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.

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