World Wildlife Fund

Adaptation: the process of changes in a living organism or in cultural systems that aid in adjustment to the conditions of the environment, facilitating the ability to inhabit and exploit a particular environment.

Airborne pollutant: a contaminant that is carried through the air.

Alternative fuel: a fuel used in vehicles that comes from a source other than petroleum, such as ethanol made from corn and biodiesel made from vegetable oil.

Atmosphere: The gaseous envelope surrounding a celestial body, comprised of the troposphere, mesosphere, stratosphere, and thermosphere.

Biodiversity: the variety of life on Earth, reflected in the variety of ecosystems and species, their processes and interactions, and the genetic variation within and among species.

Biotic factors: The living components of the environment, such as plants, animals and fungi, that affect ecological functions. The physical and chemical non-living factors in an environment are termed abiotic.

British Thermal Unit: One BTU is equivalent to the amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit.

Carbon footprint: A representation of the effect human activities have on the climate in terms of the total amount of greenhouse gases produced (measured in units of carbon dioxide). Substitute: Ecological footprint

Climate: The average course or condition of the weather at a place usually over a period of years as exhibited by temperature, wind velocity, and precipitation; the prevailing set of conditions.

Climate change: The changing of Earth's temperature and weather patterns due to the release of greenhouse gases, especially carbon dioxide from the burning of fossil fuels. The gases accumulate in the atmosphere and act like a blanket, trapping heat. This results in a wide range of climate shifts, including simple warming of the planet's average temperature, as well as regions becoming wetter, dryer, and stormier.

Compact fluorescent light bulb (CFL): An alternative to incandescent light bulbs, which lose 90% of their energy to heat, CFLs use 1/5 to 1/4 of the energy and last up to ten times longer.

Conservation: a careful preservation and protection of something; planned management of a natural resource to prevent exploitation, destruction, or neglect.

Desertification: The progressive destruction or degradation of existing vegetative cover to form desert. This can occur due to overgrazing, deforestation, drought, and the burning of extensive areas. Once formed, deserts can only support a sparse range of vegetation. Climatic effects associated with this phenomenon include increased albedo, reduced atmospheric humidity, and greater atmospheric dust (aerosol) loading.

Ecological footprint: a calculation that estimates the area of the Earth's productive land and water required to supply the resources than an individual or group demands, as well as to absorb the wastes that the individual or group produces. Substitute: carbon footprint

Ecosystem: A community of plants, animals and microorganisms, along with their environment, that function together as a unit. An ecosystem can be as large as a rain forest or as small as a rotting log.

Efficiency: The more ecologically aware use of energy in order to reduce economic costs and environmental impacts. Using less energy/electricity to perform the same function.

Emissions: substances discharged into the air (as by a smokestack or an automobile engine). Energy star: A program of the US Government that certifies and labels products that are energy efficient.

EPA: The US Environmental Protection Agency; sets and enforces the standards on national pollution control.

Ethanol: Can be produced chemically from ethylene or biologically from the fermentation of various sugars from carbohydrates found in agricultural crops and cellulosic residues from crops or wood. Used in the United States as a gasoline octane enhancer and oxygenate, it increases octane 2.5 to 3.0 numbers at 10% concentration. Ethanol also can be used in higher concentration in alternative-fuel vehicles optimized for its use.

Fossil Fuels: fuels formed millions of years ago from decayed organisms. Oil, coal, and natural gas are all fossil fuels; nonrenewable energy.

Geographic range: The area bounded by the location of outlying populations of a species; the location of the smallest area within an imaginary boundary line that encloses all populations of a species. Global warming: The increase in Earth's temperature caused by emissions of carbon dioxide and other gases that blanket the planet and trap heat within the atmosphere.

Greenhouse gas: see heat-trapping gas.

Greenhouse effect: The process that raises the temperature of air in lower levels of the atmosphere because of heat trapped at higher levels by "greenhouse gases" such as carbon dioxide, methane, and ozone.

Gross Domestic Product (GDP): Total value of a country's output, income or expenditure produced within the country's physical borders.

Habitat: the area where an animal, plant, microorganism, or other life form lives and finds the nutrients, water, sunlight, shelter, living space, and other essentials it needs to survive. Habitat loss, which includes the destruction, degradation, and fragmentation of habitats, is the primary cause of biodiversity loss.

Heat index: An index that combines air temperature and humidity to give an apparent temperature (eg. how hot it "feels").

Heat-trapping gas: any of several dozen gases in the earth's atmosphere that absorb infrared radiation. The two major heat-trapping gases are water vapor and carbon dioxide; others include methane, chlorofluorocarbons, and nitrogen oxides.

Hybrid-electric vehicle (HEV): A vehicle with a dual power system, usually a conventional internal combustion engine that runs on gasoline and an electric motor powered by batteries. Hybrid-electric vehicles are more fuel efficient and emit fewer pollutants than conventional vehicles.

Interdependence: The concept that everything in nature is connected to each other, and cannot survive without the help of other plants, animals and abiotic factors (such as sun, soil, water and air) around it.

Intergovernmental Panel on Climate Change (IPCC): Established in 1988 by the World Meteorological Organization and the United Nations Environment Program (UNEP), the IPCC is the authoritative international body charged with studying climate change. The IPCC surveys the worldwide technical and scientific literature on climate change and publishes assessment reports. Its widely quoted 1995 report found that "the balance of evidence suggests that there is a discernible human influence on global climate."

Kilowatt Hours (kWH): the basic unit of electric energy equal to 1 kilowatt or 1,000 watts of power used for one hour. The amount of power the customer uses is measured in kilowatt hours (kWh). A 100-Watt light bulb operated for 10 hours uses 1 kWh.

Mitigation: The elimination, reduction or control of the adverse environmental effects of a project, and includes restitution for any damage to the environment caused by such effects through replacement, restoration, compensation or any other means; actions and programs that reduce the risks and impacts associated with natural hazards such as climate change.

Natural resource: any aspect of the environment that species depend on for their survival. People depend on natural resources such as land, soil, energy, and fresh water.

Non-renewable energy: energy obtained from sources that are exhaustible, such as oil, coal, and natural gas.

Overconsumption: the use of resources at a rate that exceeds the ability of natural processes to replace them.

Phenology: The study of the relationship between climate and the timing of periodic natural phenomena such as migration of birds, bud bursting, or flowering of plants. Renewable energy: energy obtained from sources that are essentially inexhaustible. Renewable sources of energy include wind and the sun.

Sequestration: The uptake and storage of carbon. For example, trees and plants absorb carbon dioxide, release the oxygen and store the carbon in above ground organic matter or in the soil. In the context of climate change response strategies, sequestration usually refers to the process of increasing the storage of carbon, for example reforestation, increasing the carbon content of the soil, or removal of carbon dioxide from flue gases for storage below ground or in the deep ocean.

Sustainability: The extraction of resources at a rate not exceeding nature's capacity to replenish them; meeting present human needs for resources without damaging the ability of the ecosystem to provide for future needs of people and other species.

Thermohaline: In oceanography, the circulation path determined by temperature and salt downwellings due to surface-water density created by low temperature and high salinity. Because dense water tends to eventually sink through less dense underlying layers, it contributes a vertical aspect to ocean currents.

Vector: A carrier of an infectious agent; capable of transmitting infection from one host to another.

Weather: The specific condition of the atmosphere at a particular place and time. It is measured in terms of such things as wind, temperature, humidity, atmospheric pressure, cloudiness, and precipitation. In most places, weather can change from hour-to-hour, day-to-day, and season-to-season. Climate is the average of weather over time and space.