Two eminent scientists are sounding dire warnings about the intensity and speed of climate change.
A former head of the CSIRO's atmospheric research unit is warning that it will only be a couple of years before we will see stark evidence of global warming.
And Australia's former chief scientist says governments around the world will need to use every option available to slow the warming of the planet.
These scientists have voiced their concerns just days before the United Nations' Intergovernmental Panel on Climate Change (IPCC) is due to release the last of its four reports.