I see that the USDA has some software related to conservation up for download [1]. Anything from water budgeting on farms to Animal Waste Management. I did not download or test any of this software, just found it after a quick search.

Then there's this organization that ran out of funding, but contacting one of the former team members may help you. [2]

There is development of software that doesn't directly affect the environment but rather helps dictate what work should be done to improve/conserve conditions. This book seems to address this topic. [3]

Here are some other random related things. [4] [5]

Unfortunately, it seems like software engineers are mostly used to develop management software. Modeling software is closer to the type of action I suspect you are interested in. It is needed, though I doubt the software engineers are helping analyze data and building solutions based on that research. I could be very wrong.

EDIT: I should clarify. A SE COULD analyze the data, but in the context of a paid full-time position I doubt your employer would want you to spend your time doing that.

If you find any information regarding "environmental [activism/conservation] with software", or something like that, please let us know.

DISCLAIMER: I don't know what I'm doing ;)

[1] http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/ndc...

[2] http://se4s.ics.uci.edu/

[3] http://www.journals.elsevier.com/environmental-modelling-and...

[4] http://www.conservation.org/NewsRoom/pressreleases/Pages/sof...

[5] http://www.capterra.com/environmental-software/