In this interview, Rutgers University climatologist Alan Robock talks with Elisabeth Eaves from the Bulletin about geoengineering and nuclear winter. He says that geoengineering is not the solution to global warming because of its many risks and unknowns. He notes that some of the technology that would be required to implement geoengineering has not been developed and that many socio-political questions would have to be resolved before it could be put into practice. The world would have to reach agreement on a target temperature and on what entity should do the implementing. Robock’s biggest fear with regard to geoengineering is that disputes over these questions could escalate into nuclear war which in turn could cause nuclear winter, producing global famine among other effects. He goes on to describe his meeting with former Cuban President Fidel Castro and discuss the role of the arts in addressing existential threats.