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The Journal of the Royal Institute of Thailand Volume IV - 2012 167  Monnipha Sila-asna, Ahnond Bunyaratvej Results and Discussion Histogram of rising world population from year 1 to year 2083 was analyzed using geographic data (Rosenberg M., 2012). The world population was six billion in1999 and was estimated at 7,021,836,029 in mid-year 2011. Although control of population growth in some countries, particularly developing countries, has been successful the overall population is still rising during the current decades as shown in Figure 2. Figure 1: Basic needs of human in the scenario of optimal human population