In this article Crichton debunks SETI, Nuclear Winter, second-hand smoke and global warming. Money quote 1:
There is no such thing as consensus science. If it's consensus, it isn't science. If it's science, it isn't consensus. Period.
Money quote 2:
Nobody believes a weather prediction twelve hours ahead. Now we're asked to
believe a prediction that goes out 100 years into the future? And make financial investments based on that prediction? Has everybody lost their minds?
He gives lots of historical examples where science is polluted by established interests resulting in disastrous consensus. Read it. Via
Jerry Pournelle.