The article compares two theories about Earth: Gaia theory by James Lovelock and biosphere theory by V.I. Vernadsky. Both theories suggest Earth functions like a living organism. James Hutton first proposed this idea. Gaia theory focuses on the relationship between living and non-living processes on Earth. Vernadsky's biosphere theory also sees Earth as a self-regulating system. Another scientist, V.N. Beklemishev, looked at the biosphere from a different angle. The main question is: What sets Gaia theory apart from the biosphere theory?