Climate change and energy supply challenges will have substantial impacts on both human society and the natural world. These impacts confront humanity with the need to make what will be in the aggregate trillion-dollar decisions. Given that no plausible policy will avoid all consequences, decision makers must also plan for a world with changed climate. Our work focuses on integrating uncertain information into characterizations of expected climate damages in order to more accurately assess the costs and benefits of climate change, and identifying decision making strategies that are robust to inevitable uncertainties.