Reuters: Drought in several Zimbabwean provinces is likely to damage the main 2008 maize harvest and could worsen an already tight food security situation there, the United Nations’ food agency said on Thursday. "The food security situation in Zimbabwe is critical," Food and Agriculture Organisation (FAO) said in a statement. "Food insecurity for about one-third of the vulnerable population keeps worsening." Zimbabwe’s economy lies in ruins with the world’s highest …