Precautionary approaches to approving new technology are irrational, he said, because they demand that we know whether something is safe before we can do the very tests that would demonstrate its safety or dangerousness. Furthermore, precaution eliminates the benefits of new technology along with the harms. He advocated enhancing society's capacity to cope with and adapt to the unexpected, rather than trying to prevent all catastrophes in advance.
http://en.wikipedia.org/wiki/Aaron_Wildavsky
