Yes, the URL of the sustainability wiki is swithun.servebeer.com/sustainability
. I think Dandolo added a link to a talk page, and then I added a page on cleaning.
The Leeds green guide is here
Editing wiki pages is pretty easy. What we want at the moment, I think, is lots of text and ideas. The appearance doesn't really matter at this stage. To create a new page, you first need a link to it from an existing page. So, you need to edit the existing page to add a link, which is done with double square brackets, like this: [[ NameOfPage | link text]], which would go to NameOfPage when you click on 'link text'. Save your edit and click on the new link to add some content.
There are links to help pages in the left hand column on all the wiki pages. If you are editing someone else's page, be nice, unless they have written some real crap.