ON Friday, the Intergovernmental Panel on Climate Change will release a summary of its report for policymakers. It will reinforce the view among many scientists and policymakers that a great deal of the increase in air temperature that the world has experienced, until recently, is due to man-made emissions of carbon dioxide and other greenhouse gases. The contribution remains contentious and its impact remains contentious.
What to do, if there is a problem, is especially contentious. How does a government frame policy in response to uncertainties of man-made climate change and its impact? What should the Abbott government do?