Since the 1950s, there has been a steady increase in the levels of atmospheric CO2 as a result of
A) increased human activity.
B) an increase in naturally occurring forest fires.
C) increased volcanic activity.
Correct Answer:
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Q16: Using plants to create "carbon sinks" to
Q17: The phenomenon called _ is due to
Q18: Carbon molecules can form long chains called
Q19: Which of the following best describes the
Q20: Fires and volcanic activity are natural events
Q22: Methane versus carbon dioxide are very important
Q23: Which of the following minor contributing greenhouse
Q24: According to the evidence of climate change,
Q25: Methane
A) is a greenhouse gas.
B) releases more
Q26: The average global temperature has always measured
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