English: A comparison between the 1988 global mean temperature projections shown by James Hansen in his 1988 congressional testimony and the subsequent observations.
Scenario A assumes rapid exponential growth of GHGs and includes no large volcanic eruptions.
Scenario B has continued moderate increase in the rate of GHG emissions and includes three large volcanic eruptions.
Scenario C assumes GHGs were to stop increasing after 2000.
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{{Information |Description={{en|1=A comparison between the 1988 global mean temperature projections show by James Hansen in his 1988 congressional testimony and the subsequent observations.}} |Source=http://pubs.giss.nasa.gov/docs/2006/2006_Hansen_etal_1.
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