A review of several energy-matter cycles reveals that the Earth can be compared to a finely tuned watch, adjusted to the degree that minor mistuning can have critical adverse repercussions for life here. Paley’s watch design argument thus applies not only to living organisms, but also to the complex entity called the Earth. We are only beginning to understand the workings of its complex balance and recycling mechanisms. In this paper I briefly review a few of the many mechanisms that exist illustrating Earth’s complexity.