Land, water scarcity threaten food security - U.N.

MILAN (Reuters) - A rapidly growing population, climate change and degradation of land and water resources are likely to make the world more vulnerable to food insecurity and challenge the task of feeding its people by 2050, the United Nations' food agency said.

The world would have to boost cereals output by 1 billion tonnes and produce 200 million extra tonnes of livestock products a year by 2050 to feed a population projected at 9 billion people, up from 7 billion now, according to U.N. estimates.