Florian Ulrich Jehn is a scholar who examines ways that humanity could mitigate starvation risks in the event of existential crises, such as nuclear war. He and colleagues have published a peer-reviewed report which considers the possibility of the mass cultivation of seaweed in the aftermath of a nuclear war.
Such an event and any ensuing nuclear winter could devastate terrestrial food production due to reduced sunlight. But tropical oceans are likely to remain environmentally sound. The authors conclude that it might be possible to produce sufficient quantities of Gracilaria tikvahiae in quantities equal to 45% of global human food needs.
-via Marginal Revolution | Still shot from Stanley Kubrick's Dr. Strangelove