GLOSSARY

2. The relationship between living things (including people) and their physical environment
3. cycle The naturally occurring processes in which carbon is exchanged between organisms and the enviroment.
5. The gradual rise in average tempertures brought about by an increase in the heat-absorbing gases present in the atmosphere.
8. The totality of our surroundings
9. The physical environment in which a community of plants and animals lives.
11. The inablility to meet the basic needs for food, clothing and shelter; the absence of money, goods or the means of subsistence.
14. The expansion of deserts due to overgrazing, soil erosion, climate change or prolonged drought.

1. The accumulation of substances such as pesticides in an organism.
4. The atmospheric processes that maintain an arerage surface temperature of 15c
6. The downgrading of the productive capacity of land due to the activites of people.
7. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
10. The release of any hazardous, or potentially hazardous, substance into the environment.
12. A species of animal or plant that no longer exists
13. The variety of all life forms: plants, animals and microorganisms; the genes they contain; the ecosystems of which they form a part; and the processes that link them.