By Kazuo Watanabe, Atsushi Komamine
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Additional info for Challenge of Plant and Agriculutral Sciences to the Crisis of Biosphere on the Earth in the 21st Century
In 1998, I heard from an expert on Chinese irrigation systems that most of the Chinese irrigation facilities are severely deteriorated and/or were poorly constructed. But there are not enough government fund and time to build new systems against the exploding population. Thus, the main emphasis in the irrigation policy of the Chinese government is now water saving. In 1995 a high Philippine government officer in charge of irrigation told me in my interview that there is not enough government funding to construct the irrigation facilities planned, so the limited funds must be used for rehabilitating and repairing deteriorated facilities.
Demand Factors According to the estimates of the United Nations, the population explosion that has occurred mainly in the developing countries after the Second World War will maintain its peak level during the period of 1990 to 2020. The world population increases annually by from 90 to 100 million during this period, and the world population will reach to 8050 million by 2020, from 5300 million in 1990. 7%, from 4080 million to 6660 million, during the same period. 64 % from 2900 million to 4500 million.
1). However the absolute number is still gradually increasing (Fig. 2). Income Level of Households The per capita gross domestic product (GDP) represents the economic development level of a country . It also has a direct influence on the structure and level of food consumption. Viewing the development of all the countries in the world, the higher the national income level, the more indirect grains will be consumed. The direct consumption of grain ration will continually decrease while the absolute demand of food will increase.
Challenge of Plant and Agriculutral Sciences to the Crisis of Biosphere on the Earth in the 21st Century by Kazuo Watanabe, Atsushi Komamine