This is the VOA Special English Agriculture Report.

Economists across the world are expressing concern about rising food prices. The United Nations Food and Agriculture Organization recently released its Food Price Index. The list showed that a number of foods cost more than during the world food crisis of 2008. The index is at its highest level since it began in 1990.

Demonstrations and deadly food riots have broken out this month, as they did in 2008.

The FAO predicts that world market prices for rice, wheat, barley, sugar and meat will stay high or continue rising. One reason for this is the threat of shortages caused by bad weather. Current and recent weather disasters have harmed agriculture and affected prices in several parts of the world.

For example, the current flooding in Australia has done great damage to crops in the usually fertile Queensland area. Chickpea, wheat, sorghum and corn are among the crops affected. Floods also have harmed other vegetables and fruits.

Local agricultural producers report that standing water could destroy up to half of next year's sugar crop. And economists say prices for the fruits and vegetables could likely increase over the next six months.

The effects on prices from floods last year in Pakistan and China are still being felt.

Last week, Russia extended an earlier ban on wheat exports. Russia acted after heat, drought and wildfires destroyed about a third of its wheat crop last summer. The ban was placed to make sure Russians have enough wheat. The first ban caused worldwide wheat prices climb to last year by almost 50 percent.

In Algeria, the government has reduced taxes after food riots late last year and earlier this month. Among the causes of the riots were price increases for cooking oil and sugar. Several people died in the riots, and hundreds of others were injured.

Food prices are also part of economic problems to blame for the deadly riots in Tunisia.

Shenggen Fan heads the International Food Policy Research Institute from its Washington, DC, office. Mr. Fan says countries must invest in making their farmers more productive. He says the world will need to feed more hungry people with less available land, water and other resources.

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. Our programs are online with transcripts and MP3 files at voaspecialenglish.com. I'm Steve Ember.

sorghum: very small grain grown as food in tropical countries; the plant that produces this grain 高粱；高粱米

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（來源：VOA 編輯：崔旭燕）