I would like to learn more about GIS and hear from others regarding what you’ve done with online mapping. I’m interested in doing a little of that with my students and introducing it to other teachers at my school. (I’m a technology integrator for an independent high school).
I might have a few suggestions for collaboration to give you, based on what some schools and faculty are doing in the K12 world. I agree that an online resource that allows users to contribute would probably be far more useful as a global environmental history source database. It would require some editing and supervision, I expect.
Personally, I’d like to learn more about the Omeka platform. Ultimately, I am interested in building a platform for my students (and those of other teachers) that allows them to build projects that compile digital historical sources, maps, and data from other humanities projects to draw conclusions and make suggestions.