For all interested students - these are summer internships offered by
the Urban Resources Initiative of Parks and People Foundation. As they
indicate, they are particularly interested in advanced undergraduates
and graduate students. Many of these are unpaid but you can inquire
about the details if you are interested in any of them. You may be
able to earn upper-level internship credit for these. Information on
the URI program and the Summer 2013 internships can be found here:

http://www.parksandpeople.org/learn/urban-resources-initiative/internships/.