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  Question 8 Answer B
 
Natural variations in global temperatures may occur in roughly 300-years cycles actually closer to 500 years
Which answer below provides the best explanation for the following temperature record
  b) Natural variations in global temperatures may occur in roughly 300-years cycles actually closer to 500 years

That is correct!


The primary cause of variations in Earth’s climate is the regular variations in the brightness of the Sun and changes in Earth's orbit about the Sun. In addition to 40-year cycles and 300-year cycles, other temperature cycles include:



For more information, see http://www.ngdc.noaa.gov/paleo/milankovitch.html and http://www.abc.net.au/science/news/enviro/EnviroRepublish_233658.htm


 

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Produced with the assistance of Dr. Tim Ball & Tom Harris, B. Eng., M. Eng. (Mech.), Executive Director, International Climate Science Coalition.
CSCCC FCPP is a member of Civil Society Coalition on Climate Change.
For more information see www.csccc.info.
© Frontier Centre for Public Policy 2017.
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