New Portmanteau Word Spotted - Greenternship

This is a screen print from craigslist with an ad for a new type of internship (third ad from the top on Wednesday April 22nd).

Recycling for Charities Summer Greenternship

The opened ad specifies that this charity is seeking qualified interns and that "candidates should have an interest/knowledge of green issues and initiatives." So this is an internship with a charity that is concerned with green initiatives...which gives us a new portmanteau word: green + internship = greenternship.