I suggest you go to http://populationpyramid.net/world/2016/ where you will be able to review population statistics for each troubled nation from 1950 to present.  There is definitely an over-population component to this problem.  During the famine in Ethiopia in 1984, the population was 48-million, but it has doubled since then -- and famine stalks the land again.  Finite resources are exhausted while humans continue to multiply.  There is nothing wrong with birth control and family planning, but they are not practised in certain parts of the world -- then, wars break out as humans compete for territory and dwindling resources. All this is can be complicated by unrealistic systems of beliefs, also known as fanaticism and fundamentalist extremism.