1. The population of the has been increasing faster and faster. In 10,000 B.C., there were probably 10 million people. In A.D. 1, there were 300 million. It took 1,750 for the world population to reach 625 million. In 1850, one hundred years later, the population reached the figure of 1,300 million. In 1950, the had more than doubled to reach 2,510 million. In 1985, only 35 years , there were 4,760 million people. In 2000, the population was about 6.6 billion, and by 2015 it is expected to be over 7 billion.