try to do something about this. ebola, zika, bird flu, cnn's new original film "unseen enemy" looks where the next outbreak might come from and what we might do to stop it. >> the world changes around us at increasing speed. we cause a lot of that change. migrating to cities, strichg the ear -- stripping the earth of its resources and altering the jungle. >> we're seeing total ecologies, that which you can see with your eye and that which you can only