The spring (March/April/May) of 2010 in the northern hemisphere was the warmest (land/sea combined) on record going back to 1880, according to the Goddard Institute for Space Studies (GISS).
The northern hemisphere averaged .96 C above the 1951-1980 base period normal.
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The southern Hemisphere experienced its second warmest fall (Mar/Apr/May) on record with temperature anomaly of +.50 C.
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Now, since both the northern and southern hemisphere had record or near record warmth, you must figure that Mar/Apr/May 2010 was a record for the globe. Indeed it was!
Mar/Apr/May 2010 was the warmest on record for that three month period with a temperature departure of +.73 C. The old record was +.65 set in 2002.

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How about May by itself?
May 2010 was tied with May 1998 as the warmest May on record for the land/ocean surface with a temperature departure of +.63 C, according to GISS.

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A new in-depth analysis of peer-reviewed summaries shows an overwhelming consensus among scientists that recent warming is mostly caused by human actions....
Remote Sensing Systems has just released their global satellite measured temperatures for the month of April.
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The Arctic sea ice extent declined at a fairly normal seasonal rate during the month of April, but the actual extent is still running slightly lower than what it was last year.....
Warming temperatures are found to cause an increase in concentrations of natural aerosols from plant emissions that have a slight cooling effect on the atmosphere.
Climate Change
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