Concerns about this project

The concerns I have about this project is that plastic water bottles may not be as big a problem to the world's water systems and environments as I think. Obviously they are eyesores, and its awful to let them, much less anything, just float around in the water, but how much problems does this really create? I might be hard-pressed to find explicit images of creatures suffering from problems created by the plastic water bottles; rather, I might have to find more generic pictures of water and environment pollution, and work it to my cause.

I would be appreciative of feedback that could point me to different sources for information about plastic water bottles and the problems they cause, and possibly information about the types of plastic itself.