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Updated 11 November 2004

Consequences Vol. 2, No. 1, Winter 1996
 

 

 

 

 

 

 

 
Figure 4 Estimates of the amplitudes of natural and human-induced climate forcings in the past 140 years. The combination of positive (warming) and negative (cooling) factors yield the net value of global heating (about 1.2 watts per square meter) that is needed to match the observed rise of 0.5° C in mean-surface temperature.

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