My old friend Bidisha Banerjee, now based at the Yale School of Forestry & Environmental Studies, has just written a rich, dense article for the Stanford Journal of Law, Science & Policy evaluating various approaches to geoengineering governance. As the prospect of rapid climate change has grown more pressing, a large and growing number of scholars and activists are reaching the reluctant conclusion that large-scale technological interventions might be necessary to forestall disaster, whether on a local or global scale. Yet any technological intervention will have an uneven impact, benefiting some individuals and regions at the expense of others. And so the question of governance is central to manage the potential for serious interstate and intrastate friction.