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'''Global warming''' is the term ascribed to an increase in global average surface temperature.  
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'''Global warming''' is the term ascribed to an increase in global average surface temperature.
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Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6&nbsp;°C [1.0&nbsp;°F] in the past three decades and 0.8&nbsp;°C [1.4&nbsp;°F]in the past century." <ref>http://data.giss.nasa.gov/gistemp/2005/</ref>
    
Scientists such as [[Richard Lindzen]] of MIT, [[Sallie Baliunas]] of Harvard and [[Fred Singer]] (independent) say that the patterns of global warming are naturally caused (see [[climate cycles]]).
 
Scientists such as [[Richard Lindzen]] of MIT, [[Sallie Baliunas]] of Harvard and [[Fred Singer]] (independent) say that the patterns of global warming are naturally caused (see [[climate cycles]]).
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Politicians who support the [[Kyoto Protocol]] have made the claim that there is a cause and effect relationship between increases in atmospheric concentrations of [[greenhouse gas]]es and air temperature.{{fact}}
 
Politicians who support the [[Kyoto Protocol]] have made the claim that there is a cause and effect relationship between increases in atmospheric concentrations of [[greenhouse gas]]es and air temperature.{{fact}}
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Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6&nbsp;°C [1.0&nbsp;°F] in the past three decades and 0.8&nbsp;°C [1.4&nbsp;°F]in the past century." <ref>http://data.giss.nasa.gov/gistemp/2005/</ref>
      
==Natural variability of the climate system==
 
==Natural variability of the climate system==
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