It might be impossible to fathom for some, but you don't feed the world with meat, but rice, corn etc. To make it simple: Plants. Meat is a luxury many people/countries can't afford, e.g. a country like India has a meat consumption of ~5 kg per person per year.( Source: Food and Agriculture Organization of the United Nations (FAO), FAOSTAT on-line statistical service (FAO, Rome, 2004). Available online at: http://apps.fao.org) We could actually feed the world with game and animals grown on farms, where the animals eat what they would normally eat if they were outside. The world just had to eat less, or none at all.