Replying to my own post: as a european citizen, I’m too far away from American politics to realize that Al Gore may be a controversial personality. I was surprised to see a lot of disagrees on that post, Al Gore seems to have a good reputation in Europe.Al Gore would be excellent. Nobody would doubt his motivation to be chairman, and he is certainly independent. (Note: I read somewhere that Al Gore was mentioned as possbile chairman).
I witnessed Al Gore giving the closing keynote at the 2017 WebSummit in Lisbon, and found it to be one of the best speeches on climate change I have ever seen, and the tens of thousands of people next to me in the arena (I guess mostly Europeans) definitely seemed to agree.
That being said, it’s probably not a good idea to have a poltician as chairman, as it will inevitably draw negative comments from supporters of the opposite party, and that doesn’t help the case.