What are the microcosmos and what is the macrocosmos? Those are really relative terms. They are meant to convey a relationship and can be different things in different instances. For example: When we are talking about our bodies, it is our physical selves that are the macrocosmos, while our individual cells are the microcosmos.
When we are talking about the world at large, our bodies are the microcosmos and the Earth is the macrocosmos – the little body and the big body.
On an even grander scale, when we talk about the universe, the Earth is the microcosmos, and everything else out there is part of the macrocosmos.
When we consider only the microcosmos of the self, and listen only to the urge that occur there – such as desire for food, sex, sleep, and entertainment – we often forget about how we each of the choices we make influences the world around us. It is important to be aware that we each come equipped with two natural urges: to preserve the self, and to preserve everything to which the self is related. These must not be separated. In order to sustain the life of the individual, we must sustain the larger body, the Earth. This is a very basic, but often overlooked, principle of biology called interdependency.