Malcolm Turnbull is a former Prime Minister of Australia and a director of the International Hydropower Association. His memoir "A Bigger Picture," was published last year.
The Intergovernmental Panel on Climate Change, or IPCC, report sets out in the starkest possible terms the threats to the planet caused by climate change. If you still doubt the science, just switch on the television and see if you can avoid the news reports of floods, fires or droughts around the world. Unless we stop burning fossil fuels, and dramatically reduce our greenhouse gas emissions, our world is doomed.