If you can get past the super-blatant tree-hugger theme, it's actually a decent dystopian novel.
I love trees - who doesn't? - so it's an interesting idea to think of a world without them and how people would adapt and exploit this.
Something that bugged me was the relationship between Quinn and Bea. One day - best friends, and the next it's looooooove. At least Bea is constant.
There is a smattering of language, too, so watch out.