Hansen's 1988 Predictions For Temperatures Is Accurate

It is common for those denying global warming to cite the failure of forecasting.  Well, such a declaration was premature.  In 2013 it looked like the temperatures were leveling off.  However, that didn't happen.  The deniers were wrong.  We have here the forecasts made by Dr. James E. Hansen in 1988, 30 years ago, and the observed temperatures up to 2018.

Hansen was invited to testify before the United States Senate Committee on Energy and Natural Resources on June 23, 1988.[75] Hansen testified that "Global warming has reached a level such that we can ascribe with a high degree of confidence a cause and effect relationship between the greenhouse effect and observed warming...It is already happening now"[52] and "The greenhouse effect has been detected and it is changing our climate now...We already reached the point where the greenhouse effect is important."[76] Hansen said that NASA was 99% confident that the warming was caused by the accumulation of greenhouse gases in the atmosphere and not a random fluctuation.

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There was resistance to his findings.

In 2007, Hansen alleged that in 2005 NASA administrators had attempted to influence his public statements about the causes of climate change.[121][122] Hansen said that NASA public relations staff were ordered to review his public statements and interviews after a December 2005 lecture at the American Geophysical Union in San Francisco. NASA responded that its policies are similar to those of any other federal agency in requiring employees to coordinate all statements with the public affairs office without exception.[123] Two years after Hansen and other agency employees described a pattern of distortion and suppression of climate science by political appointees, the agency's inspector general confirmed that such activities had taken place, with the NASA Office of Public Affairs having "reduced, marginalized or mischaracterized climate change science made available to the general public".[124]

But the reality of the accuracy of his forecasts puts in doubt this resistance, and buries completely the assertions of the global warming deniers about the forecasts being wrong.