Renewable energy and food supply: will there be enough land?

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Food Versus Biofuels: Environmental and Economic Costs (2009, background): “In developing countries, about 50% of wood energy is used primarily for cooking in the food system (Nonhebel 2005).”
Fuzzy input–output model for optimizing eco-industrial supply chains under water footprint constraints (2011, background): “It has been argued that the limited availability of agricultural land imposes constraints on the production of biofuels for specific countries (e.g., Ponton, 2009; Zah and Ruddy, 2009) or on a global scale (Nonhebel, 2005).”
REVIEW: Balancing limiting factors & economic drivers for sustainable Midwestern US agricultural residue feedstock supplies (2010, unknown): “Diverting corn, soybean oil, or other food crops to biofuel production has been implicated for inducing competition between food and feed, and fuel, 2,3 but increases in crop price have also helped revive rural economies.”
Considering the energy, water and food nexus: Towards an integrated modelling approach (2011, background): “Of course, areas such as food-asfuels (i.e., biofuels) tend to blur these descriptions (see e.g., Nonhebel, 2005) due to additional impacts associated with land use, land use change and use of the available biomass resource.”