This is no time for hunches – we need evidence and expertise in science | Ian Chubb

Nobody argues that science is perfect, but it has been an essential part of making us what we are

There will always be people who call for additional review or scrutiny of science when the results of a rigorous process don't yield the outcomes they want. Effectively they want incontrovertible evidence, and anything less is unacceptable to them. Incontrovertible evidence is rare in science, so it is easy to pick some cherry and use it to seed controversy and delay action.

History shows how effective the strategy has been. It also shows why the notion of the precautionary principle is so important. The principle requires that precautionary measures should be taken if the risk or threats of harm to (say) the environment are significant. It can mean taking action in the face of uncertainty. But when the available evidence is developed through a rigorous scientific process (and especially when it draws on multiple lines of evidence), suitable precautionary actions can be introduced with confidence.