denier argument no. 110 - 'Hansen got it wrong in 1988'
http://www.skepticalscience.com/Hansen-1988-prediction.htm
it's called the scientific method - observe, test, hypothesize, predict - rinse and repeat.
Not sure what your point is - please elaborate.
EDIT - don't make me get your post out from 10 years back predicting the demise of the WTS within 10 years :-)