Gep-ed - global environmental politics listserve https://groups.google.com/forum/#!forum/gep-ed
Environmental Governance - https://mailman1.u.washington.edu/mailman/listinfo/environmentalgovernance
E-Anth - Ecological anthropology http://www.aaanet.org/sections/ae/index.php/listserv/
environmental sociology http://envirosoc.org/listserve.php
Association for Environmental Studies & Sciences - http://www.aess.info/content.aspx?page_id=22&club_id=939971&module_id=167704
ecolog - mostly ecology, but many jobs in natural resources are advertised here as well - http://www.lsoft.com/scripts/wl.exe?SL1=ECOLOG-L&H=LISTSERV.UMD.EDU
The cultural and political ecology specialty group of the American Association of Geographers http://lists.psu.edu/cgi-bin/wa?SUBED1=AAG-CESG-L&A=1
The Political Ecology Society Listserve - http://listserv.utep.edu/mailman/listinfo/pesoemails
The Social Science Working Group of the Society for Conservation Biology https://conbio.org/groups/working-groups/social-science/sswg-email-list
Collective Action and Property Rights News (this is a program of the Consultative Group for International Agricultural Research, and thus posts alot of jobs related to international agricultural development, including many that will be of interest to environmental social scientists) http://news.capri.cgiar.org/
DISCCRS - http://disccrs.org/subscribe - climate news & jobs (they also maintain a list of listserves, some of which may be of interest) - http://disccrs.org/career
IISD maintains a number of listserves for environmental news, and some of these listserves also contain job postings. Some of them are very high traffic, some are low, and some have alot of job announcements (generally more in the NGO/international development sector than straight up academic jobs), while some do not. If some of these listserves sound like they match your areas of interest, try them out.
Also, not jobs, but Terra Viva has a searchable directory of environmental funding opportunities - including conventional grants, and also fellowships, graduate assistantships, and postdocs. You can also sign up to receive email alerts about new funding opportunities in your areas of interest.
In addition, general academic jobs websites, such as those run by the Chronicle of Higher Ed and Inside Higher Ed allow you to specify searches using key terms, although in my experience, most environmentally focused jobs also end up on one or several of these listserves.
If there are others that I am not aware of, please add them in the comments, and good luck on your academic job search!