After three decades of inaction, human-induced climate change is the greatest threat, and opportunity, facing this country, far outweighing the issues dominating our domestic political discourse, such as the US/China impasse, a faltering economy and religious freedom. The world faces the same threat. Climate change now represents an existential challenge which, if not addressed as a genuine emergency immediately, will destroy human civilisation as we know it within decades. Immediate, in that the actions we take today, particularly expanding fossil fuel use thereby increasing global carbon emissions, are locking-in that outcome.