1. History It took from beginning of human history to A.D. 1800 for Earth’s population to reach 1 billion. 1800-1930  2 billion 1930-1975  4 billion

2. Current population at 7.1 billion India is projected to surpass China in population by 2050. U.S will have estimated 420 million people.

3. Assess Demographic Transition Birthrates Total Fertility Rate (TFR)- average # of children born per women during reproductive lifetime (15-44) A TFR of 2.1 is needed to produce a stabilized population called zero- population growth. Rule of 72

4. Why is this important? Virtually all of the major problems we face today relate in some critical way back to population growth. Thomas Malthus- Human ability to multiply would exceed our ability to increase food production. Will cause famine, disease, war

5. Lifestyle If everyone on Earth lived as a Middle Class American consuming roughly 3.3 times level of food and energy resources and about 250 x clean water  2 billion. http://www.youtube.com/watch?v=CAUVGYz3 pZw http://www.youtube.com/watch?v=dD- yN2G5BY0

6. Sources Cunnignham, P. William and Cunningham, Mary Ann. Environmental Science a global concern. 12 th ed. New York: McGraw-Hill Companies Inc., 2012. Print. Damash Mona and etc., The Human Mosaic, 11 th ed. New York: Pearson/Longman, 2010. Print.