 This is the VOA's Special English Agriculture Report. Food prices are down from their record highs in February of 2011, but prices are still higher than they were a year ago. In a year of Arab protests, high food prices helped fuel the anger against oppression, corruption and poverty. Many experts think the political fires in Egypt and other countries started in the summer of 2010 in Russia. Heat, drought and wildfires destroyed one third of Russia's winter wheat crop. World food prices rose after Russia halted wheat exports. The last time food prices jumped was in 2008. At that time, Egypt was also among the countries where food riots and demonstrations took place. Riyaf Naqshbendi is a professor in the Department of International Business at American University in Washington. He agrees that food prices played a part in the Arab revolutions. At the end of the day, the most crucial reason for the Arab Spring is basically economic. And so consequently, when a citizen cannot have enough money to purchase food and feed his family, definitely that will create a kind of upset with the system. Professor Naqshbendi says an event like climate change can affect food production in many countries. But in a globally connected economy, even an event in one country can be felt worldwide. Cornell University economist, Chris Barrett, says another problem is that gains in farm production have slowed. He says, what we are seeing right now is the bitter harvest of very poor investments in agriculture research over really the last 20 years. Shen Jin-Fan is head of the International Food Policy Research Institute in Washington. He says the return of high prices in 2011 offers some important lessons. If investment in food production does not increase, he says, then the world will continue to see high prices and price hikes will come more often. He says food supplies are not growing enough to meet the demand of 7 billion people. The world is expected to add 2 billion more by the middle of the century. And people in emerging economies like China are eating more meat, which requires more animal feed. But in 2011, for the first time, the United States used more maize or corn for biofuels than for animal feed. The good news is that high prices always encourage farmers to grow more. A record harvest in 2011 is helping to ease food prices in many parts of the world, but not all. For VOA Special English, I'm Alex Villareal.