From the coal fields of West Virginia to the corn fields of Iowa, governors are talking at their summer meeting about moving beyond ethanol produced just from food sources.

They sometimes have different priorities in reaching this conclusion -- priorities that can be as simple as who grows corn and who feeds it to livestock.

And they're also not talking about replacement so much as supplementing: using switchgrass or wood waste products, for example, along with corn.

Still, the conversation has big implications. According to the Renewable Fuels Association, the nation has 134 ethanol plants in 26 states with 77 more under construction or expanding.

Nebraska is the second-largest ethanol producer in the country. The state's Ethanol Board says Nebraska's 21 ethanol plants annually produce more than 1.3 billion gallons of ethanol.