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Urgent action is required to develop alternative , clean , and renewable sources of energy for Africa to avoid increasing GHG emissions and to stem widespread deforestation . However , even in areas with sufficient solar radiation such as South Africa , solar cookers can only replace approximately 40 per cent of a household ’ s energy needs ( GTZ and DME 2004 ) . Some might argue that this is too slight a difference to be concerned with , but when it is recalled that the title pages were not produced separately but formed the first page of the eight in a half-sheet one must assume that the two variants are distinct editions since no printer would be whimsical enough to remove his forme from the press to rearrange a title page when the total difference amounted to little more than a centimetre , nor is it likely to be the result of an accident occuring to the page locked up in a single forme . For example , the underlying cause of much of Africa 's widespread poverty is the high rate of population growth , and it is poverty that forces people to overexploit their natural resources and thus degrade their environment . African governments should also promote sustainable agricultural production techniques to avoid the adverse impacts of the sector on the environment .