How the earth’s population has grown to 7 billion 200 million: when it comes to less than one million people out of Africa, American Museum of Natural History recently released a video describing the growth of the human population. 100 thousand years ago, when modern humans began to move out of Africa, the world’s population was less than one million; today, the world’s population is more than $7 billion 200 million. The video points out that from 200 thousand years ago, modern humans have just appeared on the continent of Africa, the human population began to migrate to the world during this period of time in the past 100 thousand years, the population is likely to have been maintained at less than 1 million. Then with the development of agriculture, population growth began to accelerate. By the year first Century, the population of the earth was about 170 million. And the human race has only begun to grow rapidly in modern times. It took nearly 200 thousand years for the human race to reach a population of about 1 billion, and after that, it took only about 200 years to reach the present level. Sina science and technology news Beijing time on November 14th, according to foreign media reports, throughout the entire history of the earth, the time of human beings accounted for only a small part, but the number of human beings are staggering. American Museum of Natural History recently released a video describing the number of human growth process. 100 thousand years ago, when modern humans began to move out of Africa, the world’s population was less than one million; today, the world’s population is more than $7 billion 200 million. And the human race has only begun to grow rapidly in modern times. It took nearly 200 thousand years for the human race to reach a population of about 1 billion, and after that, it took only about 200 years to reach the present level. The video points out that from 200 thousand years ago, modern humans have just appeared on the continent of Africa, the human population began to migrate to the world during this period of time in the past 100 thousand years, the population is likely to have been maintained at less than 1 million. Then with the development of agriculture, population growth began to accelerate. By the year first Century, the population of the earth was about 170 million. The next video tells the story of Rome during the Han Dynasty and the empire. By ad 100, the total population of the two countries was about 176 million. With the Silk Road, the golden age of India, the Mayan civilization, and the emergence of Islam, to 700 ad, the total population of the earth reached a total of 190 million. The population has been further improved after the invention of the compass. By the year 1100, the population reached 210 million. In the period from 1300 to 1400, the black plague, the population appeared in a rare decline. In 1700, the population was only 590 million. But soon after, the rapid development of modern science and medicine, coupled with the arrival of the industrial revolution, the population began to soar. In 1800, the global population has reached 1 billion. Only 200 years later, the number of people on earth is now over 7 billion 200 million. Experts believe that if the world population continues to maintain the current trend of development, to 2100, the population will exceed 11 billion. Although the birth rate of almost every country is declining, the rate of population growth is slowing down. But if the people on the earth;相关的主题文章: