High grain prices are rapidly driving up the cost of agricultural land, but some experts are warning we might just be watching the next real estate bubble in the making.

Biofuel Energy says it's closing its ethanol plant in Fairmont until the price of corn comes down. The drought that has ravaged the Midwest's corn crop has pushed up corn prices and erased the profit margins of ethanol producers. A plant in Little Falls shut its doors this summer.

Federal law requires that gasoline be blended with ethanol or other biofuels. About 40 percent of the nation's corn now goes toward ethanol production. But in a year when dry weather will mean less corn and higher prices, Minnesota's Chip Cravaack is among Congressmen urging that more of the crop be used as food.

Livestock farmers are demanding changes to the nation's ethanol policies. They say the fuel is taking up too much of the corn and that a grain shortage could cause meat prices to spike. Food producers also worry federal policies would exempt the ethanol industry from rationing during a shortage.

The Central Minnesota Ethanol Co-Op has suspended operations until they can buy corn or sell ethanol at a better price, the St. Cloud Times reports. The Little Falls plant is using the downtime to complete maintenance and other projects, but most of the 30 employees are out of work.

The 28th International Fuel Ethanol Workshop and Expo, the largest trade show for the country's ethanol producers, is taking place at the Minneapolis Convention Center this week. On Tuesday, the convention highlighted how the ethanol industry is faring since the expiration of a federal tax credit.