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Define relative efficiency.
Natural Gas
A clean-burning hydrocarbon gas that is a crucial part of the global energy supply, used for heating, electricity, and as a fuel for vehicles.
Nuclear Energy
Energy released during nuclear fission or fusion, especially when used to generate electricity.
Renewable Energy Resources
Natural sources of energy that can be replenished, including solar, wind, hydroelectric, biomass, and geothermal energy.
Oil Imports
The purchase of petroleum products or crude oil from foreign countries to meet a nation's energy needs and fuel its economy.
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