There's a hidden danger in the ascendancy of climate-change denialism in Canberra. It won't last - denials of reality can never last - but while it does it's an enormous distraction.

The obvious cost is that the longer we leave it to get serious about playing our part in reducing global greenhouse gas emissions, the more expensive and disruptive our efforts will need to be.

Illustration: Kerrie Leishman

But there's also a hidden cost. The more time we spend arguing about climate change, the more our attention is distracted from the many other threats to the economy and our way of life coming from other environmental problems.

We've been conscious of the many other ways economic activity has been degrading our natural environment for decades. We've been working to reduce that degradation for decades, and the need for action has been clear to people on all sides of politics.