The Tundra plays a large role in the temperature regulation of the planet. As warm air rises from the tropical zone it is cooled in the Tundra causing it to sink back down to the equator. This causes weather and air currents. Without this system climate as we know it would change drastically around the world. Areas that once could support life may not anymore. It is also a winter home for many species of birds. If they were to disappear from the food chain it would cause devastating changes to other species dependent on the tundra. The tundra is a key factor in global biodiversity.