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Average Earth surface air temperature has risen just over one degree since 1850.
'''Global warming''' is the term ascribed to an increase in global average surface temperature.
'''Global warming''' is the term ascribed to an increase in global average surface temperature. Average Earth surface air temperature has risen just over one degree since 1850.
Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6 °C [1.0 °F] in the past three decades and 0.8 °C [1.4 °F]in the past century." <ref>http://data.giss.nasa.gov/gistemp/2005/</ref>
<ref>Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6 °C [1.0 °F] in the past three decades and 0.8 °C [1.4 °F]in the past century." 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]]).