1) The process of natural leading to formation of forests has been brought largely to a halt in developed countries as a result of the ever increasing demand for land to feed the human population.
2) Extensive deforestation is carried out in developing countries to provide land for crop-growing and timber for .
3) The increased level of food production achieved in recent years has been in part due to the use of , herbicides and although their use also carries disadvantages.
4) A significant increase in food production has been achieved by using varieties of plants developed by breeding, although these plants need high concentrations of fertiliser.
5) Future manipulation of plants by recombinant is expected to produce high-yield crops requiring little or no fertiliser or pesticide.
6) is the condition suffered by a person who fails to receive an adequate quantity of food. is the condition suffered by a person who fails to receive a balanced diet. Lack of an essential foodstuff in the diet leads to a disease.
7) Water is renewable in that it is constantly . However, fresh water is a resource which could act as a limiting factor on the increase of the human population.
8) The demand for water is always increasing and it is therefore important to find ways of making more efficient use and reuse of it, such as constructing and schemes.
9) Supplies of water in some parts of the world are unpredictable due to changes.
10) , erosion and all lead to environmental degradation and disturb or eliminate the effects of the water supply cycle.
11) A disease can have a effect on a population and keep it in check. This natural check is removed when a is found for the disease.
12) and antibiotics have been used successfully against many diseases and have contributed to the increase in human .
13) and childhood diseases still account for millions of deaths amongst children in developing countries every year.
14) Improved , mains sanitation and quality of living conditions promote development of good health and natural to disease and contribute to population increase.