Sustainability Science - New Section in PNAS

PNAS has launched a new section, entitled Sustainability Science, for its journal. This section deals with "the interactions between natural and social systems, and with how those interactions affect the challenge of sustainability". It is seeking submissions - details can be viewed at:
http://www.pnas.org/misc/sustainability.shtml

A complete collection of articles in this new section is at:
http://www.pnas.org/cgi/collection/sustainability_sci