Planet Earth is perfect. It orbits at the perfect distance from the sun; it tilts at just the right angle, and it has a moon just large enough to hold it in place. On top of that, the day-to-day workings of the planet naturally serve to nurture its plants and animals. The five-part series will show how the forces of nature, weather, ocean currents, solar energy, and volcanoes, drive, shape, and support Earth's great diversity of life.