for researcher denise hardesty, slat's device was certainly no silver bullet. you're skeptical? ove to be wrong. what i'm suggesting is that we use our resources wisely and focus on the items close to source, where we can clean them up. >> alfonsi: get it earlier? >> hardesty: get it early. >> alfonsi: get it closer to the shore? >> hardesty: get it close to shore. and if you really want to focus it, be smart, have these big trash booms near the city centers. because that's where we lose much more of it, as well. and if you want to be even smarter, stop it before it gets to the coast. you know, have some rubbish traps at rivers that feed out into the mouth of the ocean, or further upstream, even. you know, i think the analogy that you hear often is, "if you've got a flood in the bathtub, you're not going to go just get a bunch of towels and try to keep cleaning it up, because it's still flooding over. you really need to turn off the tap," right? >> alfonsi: people that we spoke to said, "this is like trying to mop up a flooded bathroom, but leaving the tap on." >> slat: i think h