[Alex3917]

From the video you linked to:

"The public thinks you have to wait until global warming is proved before you do something, but that's completely ridiculous."

The only thing from this video that suggests Dyson is a skeptic is the title.

[TriinT]

You missed the point. This article explains things in greater detail:

http://www.nytimes.com/2009/03/29/magazine/29Dyson-t.html