When I first saw this video I thought this eco-boat was just the guy with a net. But it turns out it is a little more advanced than that. Watch the video till the end. Not extremely high tech but much better than just a guy with a net.
http://www.nbcnews.com/video/brazil-makes-olympic-effort-to-keep-rio-s-water-clean-741931587900
http://www.nbcnews.com/video/brazil-makes-olympic-effort-to-keep-rio-s-water-clean-741931587900
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