Energy efficiency: Useful power output per electrical power consumed. is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The useful output may be electric power, mechanical work, or heat. Energy conversion efficiency is not defined uniquely, but instead depends on the usefulness of the output.
Emission
Emission: The release of any gas, particle or vapor into the environment.
Emergent
Emergent: occurring unexpectedly and requiring urgent action, coming into existence.
Embodied Energy
Embodied Energy: is a combination of the energy required for the process to make a product and the molecular energy inherent in the product’s material content.
Ecotourism
Ecotourism; tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature.
Ecoterrorism
Ecoterrorism: violence carried out to further the political or social objectives of the environmentalists.
Ecological Footprint
Ecological Footprint :The resulting impacts on the environment based on the choices we make for example raw materials selection, transportation, etc.).
Ecology
Ecology: the environment as it relates to living organisms, the branch of biology concerned with the relations between organisms and their environment.
Eco-fashion
Eco-fashion: is a general term describing organic clothing that has addressed the needs of the environment as well as socially responsible working conditions.