Biodiesel becomes economically viable when the price of oil reaches ______ per barrel.Multiple choice question.$80$20$110$120

Shale oil becomes economically viable at a lower price per barrel of oil than ______.Multiple select question.tar sands oilBrazilian sugar-case-based ethanolbiodieselU.S. corn-based ethanol

The prices at which alternative energy sources become economically viable can be thought of as the ______.Multiple choice question.supply curve for oilaverage cost of productionsupply curve for energymarginal cost of production

Multiple Choice QuestionFossil fuels currently account for about Blank______ percent of the world's commercial energy needs.Multiple choice question.8054248

Multiple Choice QuestionWhat accounts for 40 percent of the oil consumption in the United States?Multiple choice question.Subway cars and trainsThe production of solar cellsAutomobiles and light trucksLawn mowers and tractors

Multiple Choice QuestionThe direct and indirect cost of subsidies that support the fossil fuel industry are estimated to be Blank______ per year.Multiple choice question.over $5 trillion20 billionabout 600 million