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Al the Green Train does three good things in my opinion:
1) It's written in easy to understand children's language
2) It gives children an opportunity to learn new words like environment, appreciation and conservation.
3) It offers colorful illustrations opposite a fun, learning story
What I found most interesting about Al was his fascination for all things of the earth and his ability to be a part of that through the rain he produced through his "rain" stack.
Expect a glossary at the end of the book explaining terms such as funnel cloud, tornado, thunder and lightning. Expect rhymes and a bit of poetic form.
I recommend Al the Green Rain Train, for its simplicity of learning within the pages; not for what it's got riding on the back cover.