In which John Green teaches you a little bit about drought, which is a natural weather phenomenon, and famine, which is almost always the result of human activity. Throughout human history, when food shortages strike humanity, there was food around. There was just a failure to connect those people with the food that would keep them alive. There are a lot of reasons that food distribution breaks down, and John is going to teach you about them in the context of the late-19th century famines that struck British India.
Famine is exacerbated by natural factors such as drought, but those only stress the system, they rarely cause the actual starvation. The real failure is that the political/economic systems created by governments and how they handle stains in the food production/distribution systems. Widespread famines are very rare in democracies and are much more prevalent in authoritarian regimes. Many of the recent examples have come from collectivation strategies that governments have implemented (currently Venezuela, but historically the Soviet Union and China). The Choices program has some good resources about teaching current events with the famines today.