1. Field notes and diary, Iowa, Minnesota, Wisconsin, Missouri, Arkansas, Mississippi, Louisiana, Alabama, Florida, Tennessee, Kentucky, 1933
2. Switchgrass yield is typically about one-half of that for miscanthus. Exceptions to this are some northern states and some southern states where switchgrass yields are relatively higher than those for miscanthus because minimum temperature are too low in the north and not low enough in the south for miscanthus growth;Perlaack;Delivered yields incorporate losses during harvesting, storing and transporting,2005
3. We obtain historical data on vehicle kilometers travelled (VKT) from Federal Highway Administration website;and use average growth rate of VMT from,2000