Crowded PlanetCrowded Planet provides a powerful look at Earth's population crisis, written by the award winning children's author Anna Claybourne. There are over 8 billion human beings living on Earth. That's a lot of people! And the world's population is still growing, which leads to a big question are there too many of us? The human population has been rising since ancient times, but it has zoomed up especially fast over the last 100 years or so. While humans