Scientific reticence allows politicians to neglect the real dangers we face. But waiting for perfect information means it will be too late to act

The Pacific Highway off-ramp at Mudgeeraba is closed due to flooding following Cyclone Debbie, 30 March 2017.
‘In the magical thinking of Australian policymakers, a pathway of gradual change, constructed over many decades in a growing, prosperous, coal-fired world stretches enticingly before us.’ Photograph: Dave Hunt/AAP