There are about 7 billion people on the Earth now. The world's population is a big problem because it will cause lots of problems in the future. More people will need more food and more room.
The world population growth rate rose from about 1.5 percent per year during 1950-1951 to over 2 percent in the early 1960s.Although the growth ratethereafterstarted to fall due to(由于) people's getting married later as well as the development of technology, the rate is on the rise again now.
The important thing is not how large the population of the world is, but how fast the rate increases. The world population increased from 3 billion in 1959 to 6 billion by 1999.The world population will grow from 6 billion in 1999 to 9 billion by 2050.This great growth of the population will create a big problem by the year 2100-there will be over 10 billion people in the world then.
