I was thinking of a way to make something that purifies ocean water without damaging the environment, but I'm still having a problem. Is there any way you can trap and clean smoke (like from a fire) without hurting the environment? I know you could trap it, but the smoke has to go somewhere and you can't just keep it bottled up I don't think, eventually there'd be too much pressure and you'd have to release it (I think, sorry if I'm wrong).