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Energy intensity
Ratio between the consumption of energy to a given quantity of output; usually refers to the amount of primary or final energy consumed per unit of gross domestic product.
Energy quality
Ability of a form of energy to do useful work. High-temperature heat and the chemical energy in fossil fuels and nuclear fuels are concentrated high quality energy. Low-quality energy such as low-temperature heat is dispersed or diluted and cannot do much useful work.
Energy-efficiency
The ratio of the useful output of services from an article of industrial equipment to the energy use by such an article; for example, vehicle miles traveled per gallon of fuel (mpg).
Enhanced greenhouse effect
The concept that the natural greenhouse effect has been enhanced by anthropogenic emissions of greenhouse gases. Increased concentrations of carbon dioxide, methane, and nitrous oxide, CFCs, HFCs, PFCs, SF6, NF3, and other photochemically important gases caused by human activities such as fossil fuel consumption, trap more infra-red radiation, thereby exerting a warming influence on the climate. See greenhouse gas, anthropogenic, greenhouse effect, climate, global warming.
Enhanced oil recovery
Removal of some of the heavy oil left in an oil well after primary and secondary recovery. See primary oil recovery, secondary oil recovery.
ENSO
El Nino-Southern Oscillation.
Enteric fermentation
A digestive process by which carbohydrates are broken down by microorganisms into simple molecules for absorption into the bloodstream of an animal.
Entitlements
Government transfer payments made to individuals having certain designated characteristics and circumstances, such as age or need.
Environment
All external conditions that affect an organism or other specified system during its lifetime.
Environmental impact statement (EIS)
A document required of federal agencies by the National Environmental Policy Act for major projects or administration-initiated legislative proposals significantly affecting the environment. A tool for decision making, it describes the positive and negative effects of the undertaking and assesses alternative actions.

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