Stephen Schneider on Uncertainty

"I readily confess a lingering frustration: uncertainties so infuse the issue of climate change that it is still impossible to rule out either mild or catastrophic outcomes, let alone provide confident probabilities for all the claims and counterclaims made about environmental problems."

-- Stephen Schneider, Scientific American (2002)

which is quoted in this paper which is interesting reading: "How science makes environmental controversies worse," Daniel Sarewitz, Environmental Science & Policy 7 (2004) 385-403.