Fourth in the Maximum Ride series by James Patterson.
This one was kind of "eh" for me. Not that the previous three are great literature or anything, they're just fun easy reads. This one however, came off really preachy.
I think what worked before was that it was mostly about these kids who just wanted to be normal kids. That seemed to take a backseat to "The Message" this time. It ended up being a let's jump on the environmental/global warming band-wagon thing.
Not that the environment isn't important, it is. But it completely took over the book and in a very heavy handed way. It felt more like propaganda than a book one would read for enjoyment.