I found the prediction that Arctic is free of ice in the summer months to be the most outlandish. The evidence for anthropomorphic global warming is declining with time.
Fortunately for us, they made a prediction that can be confirmed/denied within a short timespan. Now we can point to erroneous predictions as being based on faulty calculations, which reduces confidence in their other predictions. The bigger problem is when people make predictions about dire consequences 30 years from now and want us to spend billions (if not more) to change the course of events today.
Well folks are full of predictions about ow to spend other people's money. Just look at the roaring success of the War on Poverty for what happens when you pass out free money expecting nothing in return. It is the same principle as spoiling a little kid.