Nature
Humans originated in the natural world, and are still dependent upon it. While we can perhaps build plastic cities and generate our food artificially, removing us from our environment deprives us of a superior order to anything we've produced so far, as well as something of great beauty and possibilities for learning. Currently the public is in denial of the dire situation of our environment, which can be summarized as follows: humanity is using too much land, overfarming natural animal resources, and creating too much pollution.
While the amount of land and food that it produces remains the same, the human population of earth continues to grow exponentially. At some point, we will either expand to fill every space on earth, thus causing starvation and worldwide collapse, or we will learn to limit our population. Further, as we grow, we move more people to first-world lifestyles that are high in energy cost and waste production. The result is like a cancer infesting the globe, in that we will eat it from within and only confront the consequences when they have reached a fatal level.
To preserve nature, we must reserve most of the land and sea for the complex interlocking orbits of natural ecosystems that support each other, and through them, the whole. Every creature serves a purpose, from monocellular bacteria to elephants, and without these different levels of the global ecosystem being healthy, the whole collapses structurally and thus, after a delay, falls apart on a visible level. For this reason we must discipline our expansion and habits before we reach a stage of visible failure.
Whether or not global warming or any of the other current symptoms of natural collapse are accurately described, the basic mathematics remains the same: if we keep growing in population, and using more resources and producing more waste, eventually we will consume the earth and poison ourselves with our own waste. The primary principle of the LNSG is thus that we must achieve a balance with our environment and grant to it exclusively most of the resources on earth; in order to do this, we must re-organize our thinking toward a naturalistic view of life and impose it on all humanity.