And that's what I'm going to show you, because since 1960 what has happened in the world up to 2010 is that a staggering four billion people have been added to the world population.
E iso é o que lles vou mostrar, porque dende 1960 o que vén pasando no mundo ata o 2010 é asombroso. A poboación mundial aumentou en catro mil millóns de persoas.