Nature News: Millions of hectares of land will be needed to meet growing energy demands in the United States over the next two decades, according to new ‘energy sprawl’ estimates. The researchers behind the study say that biomass production for fuel or electricity generation will have the biggest impact on landscape and habitats.The broad analysis of potential US energy and climate-mitigation scenarios compared the land and habitat impacts of various energy mixes -- from nuclear power to biofuels -- resulting from an array of policy options. The study is published this week in PLoS ONERelated articleEnergy Sprawl or Energy Efficiency: Climate Policy Impacts on Natural Habitat for the United States of America