Ian Plimer advises corporate heads and country presidents globally on energy policy. He comments on green energy policy, renewables, greenhouse gas and Net Zero. We discuss the science behind climate change, the role of carbon dioxide, and historical data. Ian Plimer is an international energy advisor, geologist, professor, former chair of four universities, and author of more than 100 peer reviewed papers and several bestsellers including Green Murder, Heaven and Earth and The Little Green Book. He resides in Adelaide, Australia.