The U.N. secretary-general says world food production must rise by 50 percent by 2030 to meet increasing demand.

Ban Ki-moon told world leaders at a food summit in Rome today that nations must minimize export restrictions and import tariffs during the crisis that has caused hunger and riots across the globe.

Participants at the U.N. summit are trying to figure out how to head off skyrocketing food prices before millions more join the multitudes across the globe who already lack enough to eat.