Why is Yellowstone a protected area?

Yellowstone is known gloablly as the first ever national park, and perhaps the most well known. Its geoligical wonders and sheer beauty have captivated us for centuries.

UNESCO and The Man and BiOSphere program decided to make Yellowstone a World BiOSphere reserve because it is an environmental gem and is worth adding to the list of hundreds of protected biOSpheres.