Distillers Grains: Production, Properties, and Utilization - Google Books

https://books.google.de/books?id=0zDNBQAAQBAJ&pg=PA13&dq=%2522agrol%2522&hl=de&sa=X&ved=0ahUKEwiQsofz6tfSAhWjLsAKHX3TAxIQ6AEIRTA

In recent years, there has been a dramatic increase in grain-based fuel ethanol production in North America and around the world. Whether such production will result in a net energy gain or whether this is sustainable in the long term is under debate, but…