Most of the hungry are victims of political oppression.
Folks at the UN and WHO don't WANT a solution out of fear of "over-population".
Which really means they don't want folks in Africa (etc) competing for their own natural resources.
After all, the Realtors keep telling us "they're not building any more land".
However, hydroponics is starting to take off and it could soon be the case that we could have large skyscraper farms growing beef and supplying hamburgers to everyone in China and even all those in India who won't have to worry that they might be eating uncle Raj.