The energy we use to heat and cool our homes, cook meals, and transport ourselves can usually be traced to the combustion of hydrocarbons, either directly in a car engine or on a gas range, or indirectly by coal -, oil-, or gas-burning electric power-generating plant. What hydrocarbons are natural gas, coal, and gasoline made from? Why are renewable resources such a big deal these days? Research how much of the energy used in the United States is from oil, coal, natural gas, nuclear, and renewable resources. Do you think we will see a continued emphasis on renewable fuels - why or why not?