Famine. Consistent crop and fishery failures induced by ecological collapse and massive environmental change, and attendent economic failure. The world has bi

Famine. Consistent crop and fishery failures induced by ecological collapse and massive environmental change, and attendent economic failure. The world has billions living on one or two dollars per day. These people barely survive now; what happens when food shortages cause prices to strongly rise, across whole belts of countries at a time, and they stay high because crop failures become normal, and where the loss of wealth generation, from the loss of crops, hammers the economy? Bear in mind farmers cannot just "change crops". Each crop requires a particular set of skills, technologies and experience, and these are extremely poor people, both financially and in other forms of capital, such as knowledge resources. These are the billions of people without mobile phones. In poorer countries - populous countries - the production of crops is the main production of wealth for the mass of the population. For those people, with significant, systemic, sustained food price rises, there comes a point where you have had so little food, for so long, you either die from it directly, or you become ill and can't fight that illness off, and it kills you.