The world's population constantly increases, but the world's potential food production is more than capable of coping in the foreseeable future. The unhappy fact is that while western and westernized countries have plenty of food available and in great variety, many other communities, not all in the southern hemisphere, is perpetually at the near-starvation level.
The causes are partly natural and political. The primary cause is natural. The earth's land surface contains huge tracts which produce either nothing or poor crops. Where there has been systematic defoliation, e.g. in some South American and West African countries, ...