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 considerable stress for all ecosystems. making it particularly important that natural diversity be maintained as a means of adaptation.

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III. SOME CAUSES OF EXTINCTION
}} 22. The tropics, which host the greatest number and diversity of species, also host most developing nations, where population growth is fastest and poverty is most widespread. If farmers in these countries are forced to continue with extensive agriculture, which is inherently unstable and leads to constant movement, then farming will tend to spread throughout remaining wildlife environments. But if they are helped and encouraged to practise more intensive agriculture, they could make productive use of relatively limited areas, with less impact on wildlands.

23. They will need help: training, marketing support, and fertilizers, pesticides, and tools they can afford. This will require the full support of governments, including ensuring that conservation policies are designed with the benefit of agriculture foremost in mind. It may be expedient to stress the value to farmers rather than to wildlife of this programme, but in fact the destinies of the two are intertwined. Species conservation is tied to development, and the problems of both are more political than technical.

24. Population growth is a major threat to conservation efforts in many developing nations. Kenya has allocated 6 per cent of its territory as parks and reserves in order to protect its wildlife and to earn foreign exchange through tourism. But Kenya's present population of 20 million people is already /…