Is a Clean Environment a “Human Right?”

I’m not one to make fun of the impotence of the United Nations; I wish it weren’t so.  But this one does seem to be a bit outside their realm.

What does the UN’s declaring something to be a human right actually do?  Let’s say it’s clean water, adequate shelter, or, more recently in the news: healthcare.  How much closer does it put people who are deprived of these life-giving commodities from actualizing them?