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| A substance contained as an aerosol in a spray can | AEROSOL SPRAY |
| No more individuals of some species alive anywhere in the world - the species has died out. | ANIMAL EXTINCTION |
| A type of animal that might stop existing because there are only a few of that type alive | ENDANGERED ANIMALS |
| Gases ejected from an engine as waste products | EXHAUST FUME |
| Not now existing | EXTINCT |
| Noise, such as that from traffic, that upsets people where they live or work and is considered to be unhealthy for them | NOISE POLLUTION |
| To sort and collect rubbish in order to treat it and produce useful materials that can be used again | RECYCLE |
| Gases ejected from an engine as waste products | EXHAUST FUME |