Politics is a particular set of political beliefs or principles concerned with government or governing.
The Green Party is founded on the sure and certain belief that mankind is dependent on ecology, the study of our species in relation to the web of life that sustains our life.
Ecology includes the environment, but also includes our relationship with each other - the societal aspect. Economics must be founded on ecology. They are sister disciplines, since eco- relates to our habitat, -logy relates to study, and -nomics relates to administration.
This is why the Green Party, although small at this point in history, has the most important philosophical and realistic basis - a scientific basis, no less. The three main parties are based on ancient world views that are idealistic in the sense that they are based on ideas of mankind as a self-existent being.
Conservatism is based on individualism, the idea that the individual is the starting point of all thought.
The other two parties are moving towards this view, as this graph from the excellent Political Compass site shows:
The migration of the Labour and LibDem parties towards the Conservative position is an indication of the philosophical weakness of their position.
Socialism as an ideal suffered a body blow with the collapse of Communism. There is indeed such a thing as society, but human society is not a thing-in-itself, its existence is dependent on its environment. Without this ontological (existence-related) basis, socialism has no grounding, except as a set of rhetorical arguments. In the real political world, it crumbled in the face of the greater economic firepower of free-market capitalism.
Liberalism has an even weaker philosophical base. The common perception of Liberalism as an exercise in fence-sitting, on-the-one-hand-this-on-the-other-hand-that reflects the real philosophical situation: the idea of the free human being as the basis of political thought is flawed at the outset, because we are not free, our actions are constrained by environmental and social limitations. On the one hand, liberalism drifts towards neo-liberalism (the fount of free market fundamentalism), and on the other hand it drifts towards libertarianism. So Liberal Democracy is an inherently unstable position. It is a syncretism of good ideals, (liberalism and democracy), but it has no anchor.
The Green Party is at pains to emphasise our belief in social justice and equity. This is in response to 30 years of media misrepresentation of our party as a single issue environmentalist party. However, we are not an environmentalist party with social justice beliefs. We are, if you like, a single issue ecological party, and from ecology flows the certainty of our belief that economics must be founded on ecology to produce sustainability, and also the certainty that society must become more equitable, for its own sake, so as to become healthy, and also because an equitable society is the only possible way of building a sustainable human civilisation. Eco-fascism is a contradiction in terms, since fascism always ends in conflict.
So Green Politics is the politics of the future, because without green politics human civilisation has no future as a civilised species. We will just be a bunch of individuals or tribal groups leading a nasty, brutish and short existence.