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Climate change poses a substantial risk to human societies. Indeed, as concluded by the first Lancet Commission on Climate Change and Health and reaffirmed by the second Commission report released this week, ‘climate change is the biggest global health threat of the 21st Century’. In economic terms, if we continue on our current path, the influential 2007 Stern Review concluded that we might experience costs equivalent to reducing annual global GDP by 5-20% ‘now, and forever’. As such, it is clear that action to prevent such impacts must be taken.