Tens of billions spent on AI data centers. But people still starve across the planet. Amazing.
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That being said, the most common reason is simply war. If you look at the famine in Sudan right now, it is a direct consequence of the civil war (which also happens to be the biggest and bloodiest war by far in the world right now). Lost crops from weather or diseases can also restrict local food production, but it only ever really turns into a problem when armed groups prevent outside food supplies from moving to affected areas like the military in Sudan does right now.