This is due to the law that governs the phenomenon.

It's what we said
earlier about phenomena that always accelerate.

They include the law of constant acceleration.

And this is because the
rate of growth is proportional

to the quantity growing.

For the population, for
example, it is obvious that its

growth is proportional to the number of individuals.

With few people, few
parents, we have few children;

the result is a small rate of population growth.

With many people, many
parents, we have many children,

thus a high speed of growth.

A year ago, when the
population was smaller than today,

the speed of the population growth was smaller.

Next year, when the
population will have grown even more,

the speed will be even bigger.