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On the other hand [[Uranus]] has had no net change in temperature since 1977.  A rapid increase in temperature reversed itself.  The reasons for this are not understood.<ref>http://www.boulder.swri.edu/~layoung/eprint/ur149/Young2001Uranus.pdf</ref>
 
On the other hand [[Uranus]] has had no net change in temperature since 1977.  A rapid increase in temperature reversed itself.  The reasons for this are not understood.<ref>http://www.boulder.swri.edu/~layoung/eprint/ur149/Young2001Uranus.pdf</ref>
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Global temperatures change on other plants even when there is no life, something which strongly supports the idea that humans are not necessarily the cause of earth's global warming.  Moreover, the temperature on Uranus has fluctuated back and forth.  There is no reason that fluctuations cannot occur on earth, too.
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Global temperatures change on other planets even when there is no life, something which strongly supports the idea that humans are not necessarily the cause of earth's global warming.  Moreover, the temperature on Uranus has fluctuated back and forth.  There is no reason that fluctuations cannot occur on earth, too.
    
Although measurements have been made of the temperatures of other planets these are by no means thorough or comparable with the measurements used for earth. The short space of time over which measurements have been taken and the very limited spatial coverage means that reliable average figures have not been obtained. They have certainly not been taken extensively enough to produce a five year average temperature, which is the standard when determining temperature trends on earth.  
 
Although measurements have been made of the temperatures of other planets these are by no means thorough or comparable with the measurements used for earth. The short space of time over which measurements have been taken and the very limited spatial coverage means that reliable average figures have not been obtained. They have certainly not been taken extensively enough to produce a five year average temperature, which is the standard when determining temperature trends on earth.  
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