Envirowiki is still growing, but it's slow at the moment. That could change if YOU take 10 minutes out of your hectic schedule and write something on the site.
Some good places to start are:
http://en.envirowiki.info/Special:Wantedpages - a list of all the pages that are linked to, but don't exist yet. Adding even one sentence to these pages will make it the site much more coherent.
http://en.envirowiki.info/Category:Stubs is a list of small pages. If you know something about any of these topics, please expand them.
The other way for you to help envirowiki is to promote it. Email relevant pages to friends, post links in comments on blogs and forums, or just tell people in the street about it. The more people that visit envirowiki, the better!
Cheers, and happy editing!