There are worrying signs that the basic needs of the world's population are reaching a critical point, after food prices hit an all-time high last month. There are also warnings that oil prices are in a danger zone which could derail global economic recovery.UN Food and Agriculture Organisation chief economist Abdolreza Abbassian says food prices are expected to climb even higher due to the unpredictability of current weather activity.Prices of foods including cereals, dairy, meat and sugar are higher than they were in 2008, when a food crisis sparked riots in Egypt, Cameroon and Haiti.But Mr. Abbassian says while in the past prices rose quickly and fell quickly, the situation has changed.