Define net energy and net energy ratio and explain why they are important in evaluating energy resources. Explain why some energy resources need help in the form of subsidies to compete in the...

Define net energy and net energy ratio and explain why they are important in evaluating energy resources. Explain why some energy resources need help in the form of subsidies to compete in the marketplace, and give an example. What is energy density? What two energy resources have the highest energy density? What is a limitation of using energy density to evaluate energy resources?