Contrast should include

What are the advantages and disadvantages of using coal?
Why are liquid fuels more advantageous than coal or wood?
What are the potential environmental consequences of locating, extracting, transporting, and burning petroleum?
What effects does extracting natural gas have on the environment?
What are the advantages and disadvantages of using nuclear power?
Why might the use of solar power be limited in some areas?
What are the positive and negative aspects of using hydroelectric power?
What are some methods of obtaining hydrokinetic power?
What are some adverse environmental effects of wind energy?
How can agriculture benefit from wind power?
What are the advantages and disadvantages of geothermal power?
What is the difference between renewable and non-renewable resources?
What are some examples of non-renewable resources? Renewable?
How can the dependence on non-renewable resources be shifted to renewable energy resources?
What are the major reasons for reliance on non-renewable resources?
What will be the effect on our society when non-renewable resources are exhausted?
What will replace the resources when they are exhausted?
What role do renewable resources play in our energy future?