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What has the Earth's average surface temperature been for the past 900 000 years? 


A)  fairly steady temperatures until recently 
B)  a steady warming trend 
C)  fairly steady with occasional cool spells 
D)  many fluctuations of several degrees Celsius

E) All of the above
F) C) and D)

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Which of the following are scientists uncertain about? 


A)  variations in solar output 
B)  the role that oceans play in global warming 
C)  patterns of glacial and interglacial periods in the Earth's history 
D)  the role of polar ice in global warming

E) A) and C)
F) B) and C)

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Rising sea levels,increasing cloud cover,and air pollution will decrease climate change.

A) True
B) False

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On what factor does correspondence between climate models and the real world depend? 


A)  on the design and assumptions of the model 
B)  on organization 
C)  on qualifications of data entry personnel 
D)  on positive feedback

E) C) and D)
F) B) and C)

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Scientists believe that rising levels of greenhouse gases in the atmosphere are contributing to global warming,but cannot discern to what extent and with what ramifications.

A) True
B) False

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The country that is the largest greenhouse gas emitter is ______________________________.

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Which of the following is NOT a major greenhouse gas? 


A)  chlorofluorocarbons (CFCs)  
B)  sulphur dioxide 
C)  carbon dioxide and water vapour 
D)  ozone

E) A) and B)
F) B) and C)

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Which greenhouse gas has NOT increased in recent decades? 


A)  water vapour 
B)  carbon dioxide 
C)  nitrous oxide 
D)  methane

E) B) and C)
F) C) and D)

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Which of the following illustrates the discovery of the effects of CFCs and the political response to that knowledge? 


A)  a negative feedback loop 
B)  a positive feedback loop 
C)  a synergistic interaction 
D)  a lag time

E) B) and C)
F) All of the above

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____________________ is formed naturally in the upper stratosphere by short wavelength ultraviolet radiation.

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The effects of ____________________ depletion on wildlife include increased incidence of eye cataracts and reduced populations of aquatic species.

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What is the source of the greatest uncertainty in current climate models? 


A)  patterns of variation in solar radiation 
B)  the effects of clouds and ecosphere on climate 
C)  measurements of air pressure 
D)  measurements of wind speed and direction

E) None of the above
F) B) and D)

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Which of the following does NOT use CFCs in its production? 


A)  sterilants in hospitals 
B)  fuels in camp stoves 
C)  coolants in refrigerators and air conditioners 
D)  propellants in aerosol spray cans

E) C) and D)
F) B) and C)

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CO₂ CO₂    -According to the graph,as the temperature decreased 120 000 years ago,what happened to the carbon dioxide concentration? -According to the graph,as the temperature decreased 120 000 years ago,what happened to the carbon dioxide concentration?

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carbon dio...

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What would likely occur in a warmer world? 


A)  fewer droughts 
B)  more hurricanes 
C)  fewer deserts 
D)  fewer heat waves

E) B) and C)
F) A) and B)

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What would result if warming occurs in the Arctic? 


A)  The rest of the world would be affected. 
B)  No methane and carbon dioxide would be released. 
C)  Sea levels would decrease by seven metres. 
D)  Bacterial composition and organic matter would increase.

E) All of the above
F) A) and B)

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The world's economies are not affected by the effects of climate change.

A) True
B) False

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In the stratosphere,ambient temperature increases with altitude due to the absorption of UV light by oxygen and ozone.

A) True
B) False

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CFCs are released into the atmosphere by spray cans,discarded refrigerators,and leaky air conditioners.

A) True
B) False

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