if something has a yes seaweed on another thing, then the affair is harmful
garbage_waste is bad_thing. too_much_sun is bad_thing. explosive is dangerous_thing. dangerous_thing is dangerous_thing. sex is good_thing. biochemically_harmful_substance is dangerous_thing. shipping_lane is unnatural_thing. flood_zone is unnatural_thing. marina is unnatural_thing. tax_evasion is unnatural_thing.