As we approach the Conference of the Parties (COP21) in late 2015 in Paris, our leaders are facing a fundamental dilemma: to get to grips with the risks of climate change or see their ability to limit this threat slip from their hands. Today our understanding of the scale of the risks posed by climate change is much better developed and supported by seriously tested and globally accepted evidence. This report, The Economic Consequences of Climate Change provides detailed insights into the consequences of policy inaction for the global economy. Its main contribution, when compared to previous efforts in this area, is that it does so through a more detailed economic modelling framework that links climate change impacts to sectoral and regional economic activity.