On our planet, the number of inhabitants has increased a lot in the last 2 centuries.

In 1800, there were 1 billion human beings. Today, we are 8 times that number!

This strong increase is explained by the progress of medicine and by the improvement of living conditions everywhere in the world.

We are better treated than before, we are better protected against microbes, we eat better.

The result is people live longer, fewer children die in infancy and so there are more people on earth.