famine

673 million people were undernourished in 2024 — 8.2% of the global population — according to the FAO's State of Food Security and Nutrition in the World 2025 report. Sudan's civil war created a declared famine in 2024, the first anywhere in the world since Ethiopia in 2011. The world produces 1.5 times the calories needed to feed everyone. Hunger is not a production problem.

Nuclear war is the most discussed existential risk and the least understood. The bombs are the easy part. What comes after — nuclear winter, famine, collapse — is far more dangerous. Here's what science actually predicts.