Earth: If present trends continue, most agronomists believe, harvests will have to rise 50 percent or more by 2050. Different models with different assumptions make different projections, but all view the rise in demand as due both to the increase in human numbers and the increase in human affluence. With few exceptions, people who became wealthier have wanted to consume more meat. To grow more meat, farmers will need to grow more grain—much more. Wizards and Prophets have radically different ways of approaching these demands.
