Joel E. Cohen once said in his book How Many People Can the Earth Support? : “A little boy wanted to know the sum of one plus one. He first asked a physicist, who replied: "If one is matter and the other is antimatter, then the answer is zero." But if one represents a critical mass of uranium and the other represents a critical mass of uranium, then that’s an explosive issue.” Unenlightened, the little boy asked a biologist. She said: “Are we talking about bacteria, mice or whales? And for how long? In desperation, the boy hired an accountant. The accountant looked closely at the little boy and said, “Hmmm. One plus one? Tell me, little boy, how much do you want a plus one to be? » (Cohen 261) Every living thing on planet Earth needs a certain amount of resources to survive. In Cohen's anecdote, the accountant tells the boy that he is able to choose the sum of one plus one, which in this case explains the limits that humans have on resources. A plus one in this case is also the ratio of the specific supply of each resource per human being, which cannot be taken into account. Humans have the potential to act for themselves by knowing how to balance their needs. Every person on planet Earth needs space and resources to survive, but as the population increases, natural resources begin to diminish due to the ever-increasing demand. Over time, these natural resources come under increasing pressure, threatening public health and development. As the human population increases, its effects on the environment will multiply, such as the depletion of the Earth's natural resources, biodiversity and the slowdown of the dynamic economy. Citizens of the Earth must therefore contribute to the recreation of the planet. As the world's population grows, life improves...... middle of paper...... e Documents, spreadsheets, presentations, surveys, file storage and much more. Negative population growth. Internet. February 23, 2011. Gore, Albert. An inconvenient truth: the global emergency of global warming and what we can do about it. New York: Rodale, 2006. Print. Gore, Albert. Our choice: a plan to solve the climate crisis. Emmaus, PA: Rodale, 2009. Print. Knauer, Kelly, ed. Global warming: the causes, the perils, the solutions, the actions: what you can do. New York, NY: TIME Inc. Home Entertainment, 2007. Print. “Population and environment: the global challenge (ActionBioscience). » ActionBioscience - Promote the culture of biosciences. Ed. Bryant Robey and Don Hinrichsen. Johns Hopkins University, 2000. Web. February 1, 2011. Stancheva, Tina. “Human nature, technology and the environment.” Effects of overpopulation on the environment. February 6, 2003. Web. February 10. 2011.