Drought
According to the researchers, the ability of the current supply of fresh water is a serious problem worldwide. At least 80 countries in the desert and semi-desert (approximately 40% of the world population) of the two continents of Asia and Africa prone to drought and crop failure so often do not provide enough food to to feed their population.
In the 1970s drought disaster threatened about 24, 4 million people and annually killed over 23,000 people, this effect still lasts until 1980. 1985 over 154 million people belonging to 21 countries in Africa fall into famine due to drought, adding that the excessive population growth and the war spread, on the other hand also due to the management and use of resources and poor agricultural development effective. In these countries, poor people have to take time to go looking for water is often in the rivers and streams have been polluted and the water to get the women and children have to walk 16 km - 25 km a day and only get a pitcher full of water on the way back (Miller, 1988).
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