Question

How fast is the worlds population growing?

Answer 1

It growing at a rate of 1.3% representing a double time in 54 years.

Answer 2

The world's population is growing at about 1.14% a year. Check these sites. The first one is interesting; the second one gives more details.

http://math.berkeley.edu/~galen/popclk.html

http://geography.about.com/od/populationgeography/a/populationgrow.htm