Economist Paul Krugman’s endlessly repeated maxim that “productivity isn’t everything but, in the long run, it’s almost everything” has deluded far too many of the economics profession’s conventional thinkers.

It’s a throwaway line that should be thrown away.

It implies that any economic objective other than improved productivity is hardly worth worrying about. Such as? Distributional fairness aka “intergenerational inequity”. Tell that to the 40 per cent of voters under 40, and see how far you get.

Climate change managed to demand its place on the national agenda this week.Credit: AP

It implies that the structure of our economy never changes, nor does the planet we live on. So the single-minded pursuit of improved productivity will somehow either stop climate change or magically deliver us a zero-carbon economy without any need for government intervention.

Or maybe the proviso “in the long run” is saying that our great, great-grandchildren will be able to look back on the clean-energy transition as little more than a blip. What a pity we live in a succession of short runs, not the long run.

It was Garnaut who first had the vision of transforming Australia into a ‘Superpower’ in a world of ubiquitous renewable energy.

A more realistic view is that, should the world fail to stop climate change, life will become almost unlivable, much of the economy will be stranded assets, and every spare cent we have will be spent shifting from one part of the country to another, and on buying hugely expensive water and permanent air conditioning.

A less cataclysmic future would see climate change get a lot worse before the major economies finally got their act together and ended the use of fossil fuels.........

© The Sydney Morning Herald