I can’t describe it any better than The Blind Beggar does:
The very useful idea behind The Miniature Earth is to reduce the world’s population to a community of only 100 people, while keeping statistics the same. The effect enables us to see the differences on our planet with clarity, and perhaps consider how our actions impact humanity.
It is only a few minutes long and well worth a look. Praying you will, in the project’s final words, “Appreciate what you have. And do your best for a better world.”