Ministers need to put the climate-change case, and often TRACKING Newspoll on the issue of climate change and the carbon-trading schemes demonstrates an extraordinary contradiction. Despite the frenzied efforts of climate change deniers in the past five years, the belief that climate change is occurring and that it is caused by humankind has held up remarkably well. In July 2008 support was measured at 80 per cent. By April 2011 that number had declined by a relatively small margin to 70 per cent.