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Anthropogenic Global Warming Figures and Links

(figures and links for a Calvin Matters post 4/25/2016)

 

The first published predictions of AGW by Wally Broecker (1975) and the first Congressional testimony on observation of AGW by Jim Hansen (1988) ( source )

IPCC models of globally averaged temperature over the past century distinguishing natural radiative forcing only from total (i.e., including anthropogenic) forcing. Figure 'a' shows that modelling of anthropogenic and natural forcings together successfully matches observations. Figure 'b' showst that modelling of natural forcings alone diverges from the observations in the 1970s. ( source | figures )

NOAA global surface temperature anomalies (1880-2015). While the 1970s were the warmest decade up to that time, a straight line fit of 1971-2015 yields a further 0.75 C increase ( source | figure )

National Snow and Ice Data Center graphs of the decline of the extent of Arctic ice. ( source )

Maximum annual ice coverage occurs in March. The net decline indicated by the straight line fit is 1.6 million square miles, about half of the are of the 48 contiguous United States.

Minimum annual ice coverage occurs in September, showing the extent of ice that lasts multiple years. The net decline indicated by the straight line fit is 3.1 million square miles, more than the area of the 48 contiguous United States.

This page written 4/25/2016 by L. Molnar.

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