Climate Change-Famous Forecasts that Failed.

In 1969, Richard Nixon’s presidential advisor, Daniel Moynihan, summarised for the President the general concern of scientists about “the carbon dioxide problem". This report was recently released.
Moynihan’s memo reads, in part:
“It is now pretty clearly agreed that the CO2 content in the atmosphere will rise 25% by 2000. This could increase the average temperature near the earth's surface by 7 degrees Fahrenheit. This in turn could raise the level of the sea by 10 feet. Goodbye New York. Goodbye Washington, for that matter.”

These predictions were wide of the mark:

•Rather than increasing by 81 parts per million as the "pretty clearly agreed" experts feared, CO2 rose by only 45 parts per million.

•Rather than spiking by 3.9 C (7 degrees F), the actual temperature increase between 1969 and the year 2000 was a practically imperceptible 0.3 C. Which means the experts were off by 1200 percent.

•Most embarrassing of all, rather than rising 305 cm (10 feet), sea level increased by a paltry 10 cm (3.9 inches). Which means the experts overestimated that particular danger by 2950 percent.

Moral of the story: no one has ever been able to predict the future. Not even highly educated, highly regarded government advisors.
See: http://motls.blogspot.com/2010/07/nixon-was-told-sea-level-would-rise-by.html