Useful to know

Commons do not mean public
A fundamental difference with classical typology of public goods is that commons are inherited: or they represent gifts from nature and are taken care as such, or they are produced by people or groups (not always clearly identified), and then transmitted. This transmission can be long lasting process (cultural landscapes, langauges) or short ones ((Wikipédia, free software). Commons can also appear when they have been produced by a person and aimed by this person to have a common use (for example html language).
No politician or state has ever thought like that.
Naturally, commons or human rights linked to othem often depend on the protection of a State. Thus, preservation and claiming of global commons could be difficult to achieve without the different state's agreement.
Commons are fairly and durably managed when things whose availabilty is limited for all are shared, and when everybody has an access to abundant things.

Commons do not mean common property
Common property is a kind of collective property. It can occur with co-ops, heir's community or else anonymous stock corporation. As private property, common property involves the exlusion of some people (the non-owners) from access and use of the good. In this, it is different from commons.

Everything is not commons, but many things can become so.