Experts Opinions versus Scientific Forecasts, a look at IPPC report 2007.
In 2007, the Intergovernmental Panel on Climate Change (IPCC) issued its Fourth Assessment Report. The report included predictions of big increases in average world temperatures by 2100, resulting in an increasingly rapid loss of the world’s glaciers and ice caps, a dramatic global sea level rise that would threaten low-lying coastal areas, the spread of tropical diseases, and severe drought and floods.
These dire predictions are not, however, the result of scientific forecasting; rather, they are the opinions of experts. Expert opinion on climate change has often been wrong.
More at:
http://www.ncpa.org/pub/st/st308/st308.pdf