How can we know that Hansen 2006 was completely wrong? With the facts of course.

Skeptical Science blog post from 2010, shows Hansen 2006 (now removed from the current page), showing a graph and claiming the predictions were accurate.  Note the Scenario C purple line.

Woodfortrees graph using RSS land only is matched with the 2005 level, 7.7 anomaly.

It's now 10 years later, so we can look at the next 9 years of data, and compare with the prediction.  Hansen 2006 shows over 1,0 anomaly by now.  The blue line.

Here is what actually happened.

You can see why Skepticalscience no longer show you that image, the one they used in 2010.