Explain the diffi culty in replacing existing crude oil supplies with oil produced from coal, heavy oils, and tar sands. Describe the basic reasons why the nuclear power industry in the United States...

Explain the diffi culty in replacing existing crude oil supplies with oil produced from coal, heavy oils, and tar sands. Describe the basic reasons why the nuclear power industry in the United States stopped expanding during the 1990s. Describe the two ways solar radiation can be converted into more useful forms of energy and why solar energy is more cost-effective in some regions than in others.