Often being quoted from his diary (read aloud by Stephen) Karl has been heard saying things like:
"The way I look at it, if something that size (an ice cap) falls into the water it's like a big ice cube, and it's gonna freeze it up again." and "We're always making more and more stuff, right um, in the world, yknow big buildings, big planes, big boats and that. Will we ever get to a point where all this is too heavy for the world to handle?"
Here's a clip from The Ricky Gervais Show.
(You can find many more clips with the wondrous powers of youtube)