Earth Day - A day designed to inspire awareness and appreciation for the Earth's environment. It is on 22 April . It was founded by U.S. Senator Gaylord Nelson (D-Wisconsin) as an environmental teach-in in 1970 and is celebrated in many countries every year. The first Earth Day was in 1970. Earth Day is spring in the Northern Hemisphere and autumn in the Southern Hemisphere.

Eco-assessment – An evaluation of your home or workplace with the aim of cutting your energy and water usage.

Eco-bag – A ethically, organically made bag to use instead of plastic carrier bags.

Eco-bus – A bus which uses a combination of diesel and electric power.

Ecotourism - Also known as eco-tourism or ecological tourism , it is responsible travel to fragile, pristine, and usually protected areas that strive to be low impact and (often) small scale. It purports to educate the traveler; provide funds for conservation; directly benefit the economic development and political empowerment of local communities; and foster respect for different cultures and for human rights. Eco tourism is held as important by those who participate in it so that future generations may experience aspects of the environment relatively untouched by human intervention

Ecological Footprint - The resulting impacts on the environment based on the choices we make (i.e., raw materials selection, energy selection, transportation, etc).

Ecosystem - The interaction of organisms from the natural community with one another and their environment to sustain one another.

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.

Emission - The release of any gas, particle or vapor into the environment.

Emissions cap – A limit placed on companies regarding the amount of greenhouse gases it can emit.

Energy Star - An international standard for energy efficient consumer products. It was first created as a United States government program by the Clinton Administration in 1992, but Australia, Canada, Japan, New Zealand, Taiwan and the European Union have also adopted the program. Devices carrying the Energy Star logo, such as computer products and peripherals, kitchen appliances, buildings and other products, generally use 20%–30% less energy than required by federal standards.

Energy Efficient - Products and systems that use less energy to perform as well or better than standard products. While energy-efficient products sometimes have higher up-front costs, they tend to cost less over their lifetime when the cost of energy consumed is factored in.

EnviroCitizen – Citizens of planet Earth who believe they have both a collective and an individual responsibility to leave our planet a better place, progressively, for each generation to follow.

Environmental Cost - The monetary impact from the negative environmental effects resulting from the choices we make. 

Environmentally friendly - (Also eco-friendly , nature-friendly , and green ) are synonyms used to refer to goods and services considered to inflict minimal or no harm on the environment.

Environmental Movement Systems (EMS) - Series of activities to monitor and manage the environmental impacts of manufacturing activities. (Example: ISO 14001)

Environmental Protection Agency (EPA) - An independent executive agency of the federal government, established in 1970, responsible for the formulation and enforcement of regulations governing the release of pollutants, to protect public health and the environment .

Environmentally Friendly - A generic statement often used to designate a product or process that has a reduced ecological footprint when compared to other products/processes.

Environmentally preferable – products or services that have a lesser or reduced effect on the environment.

Energy efficiency – Ways and technology that can reduce the amount of electricity or fuel used to do the same work. Such as keeping a house warm using less energy.

Energy saving grant – Money awarded to you to help improve the efficiency of your home and use less energy.

Energy saving lightbulbs – Lightbulbs which use far less energy than conventional bulbs.