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you don't add the two warmings without subtracting the cooling that occurred around 1940
In the general, the term ''global warming'' can be used for any upward trend in the [[global mean temperature]], but it is mostly used to refer to the 1°F warming 1850, when the [[Little Ice Age]] ended. The two sides are divided on whether this warming is a natural recovery or the result of human activity (see [[greenhouse gas pollution]]).
In the general, the term ''global warming'' can be used for any upward trend in the [[global mean temperature]], but it is mostly used to refer to the 1°F warming 1850, when the [[Little Ice Age]] ended. The two sides are divided on whether this warming is a natural recovery or the result of human activity (see [[greenhouse gas pollution]]).
Average [[Earth]] surface air temperature has risen just over 1 °C since 1850.
Average [[Earth]] surface air temperature has risen a little less than 1 °C since 1850.
<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>
<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>