The Population ExplosionAccording to the Population Reference Bureau, in 1991, there were about 5.4 billion people in the world. The global birth to death rate was 27/9, meaning that for every person that dies, three more babies are born. From 1990 to 1991, the population increased by 95 million people, and now has continued to grow at that rate. This may appear to be no danger, but if one were to think of it as a pond doubling its amount of lily pads for 40 days, they'd see it differently. It would start out with one lily pad, the next day it has two, and on the 39th day it is half filled. However, in one day, on the 40th day, it will be completely filled. The Earth's population is doubling about every 40 years. We don't want to wait until the 79th year to fix our problem or else humankind will not have enough time to change the inevitable obstacles that come with overpopulation.In his book, The Population Explosion , Paul Ehrlich, a famous population controlist, came up with the equation I = PAT. He believes the impact on the environment is equal to the population multiplied by the affluence (meaning the amount of energy and food supply the population consumes) multiplied by the amount of destructive technology a country has. He showed that the impact is directly affected by the population. Therefore with a larger population, there is a greater impact on the Earth's water, air, and land. A common problem that people think is associated with overpopulation is running out of space to live, but there are also many other environmental predicaments that it causes. More people use more cars, need more firewood, drink more water. This causes more air pollution, more land ruined, and more water to disappear. Therefore, population control is necessary on an international level in order to protect our environment .There are experts who believe that population control is not needed such as in Singapore. The government in Singapore decided that it would be better for the country to grow in population so that they are able to help their economy. Many less developed countries promote population growth because they want their economy to grow. The experts who believe that it is better for us to let the population increase or decrease on its own also think that overpopulation will never become a problem.