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.

Intensive farming of the past decades has helped to feed millions of hungry people but it has often led to degradation of land and water systems on which food production depends, the U.N. Food and Agriculture Organisation (FAO) said on Monday