In 2050 climate change will decrease food and agricultural production by up to 30 percent in parts of developing countries, UN Food and Agriculture Organization (FAO) director-general Jacques Diouf said on Monday.

Opening the High-Level Expert Forum on world hunger, which is being held here from Monday to Tuesday, Diouf warned that climate change is bound to have a negative effect on the economy of poor and developing countries.

Noting climate change would reduce water availability and lead to an increase in weed, animal pests and diseases, the FAO chief said the combined effects of climate change could reduce potential output by up to 30 percent in Africa and up to 21 percent in Asia by 2050.

The Rome-based agency is hosting the international panel grouping more than 300 academic, nongovernmental and private sector representatives from developing and developed countries. Talks focus on finding solutions to tackle world famine and food emergency in 2050.

Global challenges and efforts in tackling famine will thus be rendered more tough. By 2050 the world's population is set to reach 9.1 billion people and in order to ensure food security Diouf said "agricultural production must increase by at least 70 percent, which means of 100 percent in developing countries."

He called for "the 192 FAO members to find the political and economic responses to fulfill such ambitious goals."