Almost every country in the world has a constitution. There exist thousands of international treaties, global institutions, and mechanisms of coordination. Why, in spite of all this, does humanity have no single planetary constitution?
The answer lies neither in a shortage of ideas nor in a shortage of lawyers. A planetary constitution has not emerged because there is no subject to bear it. A constitution arises where a political subject already exists — one prepared to recognize a common supreme norm as binding upon itself. For states, that subject is the people. For humanity as a whole, no such subject has yet taken form.
It is precisely in this gap that the practical significance of both documents resides.
The Earthlings Declaration constitutes the subject — the first voluntary form of a planetary moral-political core.
The Constitution of Humanity furnishes that subject with a supreme norm, a purpose, and the limits of its development.
Neither document can function without the other.