How about a contract series as follows, based on NASA's Goddard Institute for Space Studies global temperature (C) data for surface air temperature change, using 1950-81 as baseline:
GISS.2007.ANNUAL.MEAN<.50
GISS.2007.ANNUAL.MEAN>.50
GISS.2007.ANNUAL.MEAN>.60
GISS.2007.ANNYAL.MEAN>.70
...
The data series can be found here. Some pretty graphs here.
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