Public Trust Doctrine is a principle talking about how certain natural and cultural resources are available only for the public to use. It is the government’s job to maintain and protect the resources that are available for the use by the public. A blog written by actor, Mark Ruffalo, wrote about how New York University was trying to obtain public NYC parkland to expand the university. This plan was not liked by New York University’s faculty and neighbors. However, it was halted by the Public Trust Doctrine.
Further Reading: http://www.huffingtonpost.com/mark-ruffalo/the-time-to-save-our-nyc-parks-is-now_b_7515846.html