What do we know, more or less, for sure about the future? First, the world is getting hotter at a faster rate. Second, maintaining or increasing greenhouse emissions will result in substantial temperature increases within coming decades that entails substantial costs and risks. Third, carbon sequestration, over the coming few decades will only make, at best, a very marginal contribution to lowering atmospheric greenhouse gas concentrations. Fourth, despite the rhetoric, the world’s greenhouse gas emissions will continue to rise to at least 2030. These are our future certainties under business-as-usual. Much of the uncertainty about what the future holds is about what we choose to do about it.