The number and variety of plant and animal species that exist in a particular environmental area or in the world generally

the cutting down of trees in a large area; the destruction of forests by people

may soon not exist because there are very few now alive.

an increase in the amount of carbon dioxide and other gases in the atmosphere which is believed to be the cause of a gradual warming of the surface of the Earth.

the gas formed when carbon is burned, or when people or animals breathe out

Someone's carbon footprint is a measurement of the amount of carbon dioxide that their activities produce

The thin protective layer of gas 10 to 50km above the Earth that acts as a filter for ultraviolet (UV) radiation from the sun

energy that is produced using the sun, wind, etc., or from crops, rather than using fuels such as oil or coal

Sharing a car to a destination to reduce fuel use, pollution and travel costs.

A site that is specially designed to dispose of waste and operates with a licence granted by the Environmental Protection Agency

Small-scale tourism that aims to have a low impact on the environment, benefit local communities

A form of tourism that meets the needs of current tourists and host communities

Fuels – such as coal, gas,oil – that are formed in the ground over a long time from dead plants and animals and are used up once they are burned for energy.

Disposing of waste illegally by not using bins or official recycling centres, civic amenity sites or landfills

Plants and animals that are grown or reared without the use of synthetic fertilisers, pesticides or hormones

waste matter such as water or human urine or solid waste:

Air pollution consisting of smoke and fog, which occurs in large urban and industrial areas