Here are some resources that lean towards environmental studies.
Nature Challenge 4 kids
Thinking about an exciting career in the environmental field?
Books we like! (And, yes there are Barnes and Noble links here. No, I'm not asking you to go and purchase all your books from Barnes and Noble. If you must buy books online then try some discount online book sellers or your local small town bookseller. But, really ask your library and if they don't have them, then request they purchase them. Oh, and the reason I use the Barnes and Noble links is because I like the visual. If I see a picture of a book I can remember it a lot better if I see it later.)
Order Free Teaching Materials about Forestry, Trees and Endangered Species
I haven't recieved these yet, but I'll let you know what I think when I do.