In the murky waters of Lake Ontario just off the Toronto harbor, a stream of trash inches toward a round, tubular-looking device floating in the water. A piece of white styrofoam bumps up against the device’s lip. Then, in one fluid motion, it tumbles over the edge. With tendrils of marine plants circling the waste, it looks like the styrofoam could have entered a portal to an undersea world. Instead, the device is a gateway to a less mystical — yet vital — destination: the garbage dump. “It’s