Giving up meat certainly has many advantages for both our health and the ecology of the planet. But if everyone suddenly turns vegetarian, millions of people could be affected. People become vegetarians for various reasons. For some, the suffering of animals is unbearable, others choose a healthy lifestyle. Someone is seriously concerned about environmental issues and is fighting for the reduction of greenhouse gas emissions. No matter how much meat lovers protest, vegetarianism has many advantages. It seems that the more people would give up meat, the better it would be for the whole world. However, if suddenly all the inhabitants of the planet become convinced vegetarians, millions, if not billions, of people could suffer greatly. "In fact, it's a tale of two different worlds," says Andrew Jarvis of the International Center for Tropical Agriculture in Colombia. "In developed countries, vegetarianism will bring a lot of environmental and health benefits. But in ...