Exponential Growth

If anything grows at 5% a year, in 70 years it grows 32-fold. So, for example, if your city council aims for 5% industrial/population growth a year, in one lifetime it would need 32 times as many sewage treatment plants as it has today.

~ Roedy (1948-02-04 age:69) click to watch see lecture by Dr. Albert A. Bartlett