Just because one smart person believes that climate change is bunk I don't believe it as well. All his achievements do not legitimate his views.

"Climate change is bunk" seems like a pretty terrible summary of Freeman Dyson's position. If you disagree, a more specific criticism would be helpful. Freeman Dyson's views on the topic mostly seem to be sensible to me.

And since I am yet too uneducated and do not have the time to evaluate all the data and calculations I am using the absurdity heuristic in combination with an appeal to authority to conclude that climate change is real.

Freeman Dyson agrees. The very first line from your reference reads: "Dyson agrees that anthropogenic global warming exists".