As the World Grows:
The Unit Question

Year

Estimated Population

1650

470,000,000

1750

694,000,000

1850

1,091,000,000

1900

1,570,000,000

1950

2,510,000,000

1960

3,030,000,000

1970

3,680,000,000

1980

4,480,000,000

1985

4,870,000,000

1990

5,290,000,000

1995

5,730,000,000

Everyone knows that the world’s population is increasing. The chart at the left shows the changes over the past several centuries.

If this pattern of data continued, how long do you think it would take until we were all squashed up against each other?

You might find these facts useful:

  • The total surface area is approximately 196,930,000 square miles.
  • Approximately 29.2 % of the earth total surface area is land.

As you consider this problem, make note of any difficulties you encounter or any issues you think need clarification.

 

 

take 10-15 minutes