Focus on Evolution and Migration
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Population growth which exceeds the carrying capacity of an area or environment results in overpopulation. (Poverty Causes Population Growth Causes Poverty) Spikes in human population can cause problems such as pollution, water crisis (World warned on water refugees) (Population Growth Sentencing Millions to Hydrological Poverty) and poverty. (Population and Poverty: the Policy Issues, Part 1) (UNFPA State of World Population) World population has grown from 1.6 billion in 1900 to an estimated 6.6 billion today. In Mexico alone, population has grown from 13.6 million in 1900 to 107 million in 2007. (From Traitors to Heroes: 100 Years of Mexican Migration Policies March 2004 )
In 2000, the United Nations estimated that the world's population was growing at the rate of 1.14% (or about 75 million people) per year. According to data from the CIA's 2005–2006 World Factbooks, the world human population currently increases by 203,800 every day. (Current world population (ranked) source: "The World Factbook 2006-2007", CIA) The United States Census Bureau issued a revised forecast for world population that increased its projection for the year 2050 to above 9.4 billion people, up from 9.1 billion people. We are adding a billion more every 12 years. Almost all growth will take place in the less developed regions. (SUSPS - Population, Immigration, and Global Ethics by Jonette Christian October 9, 1999)
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