men discarding wanted in an conversion range protect to that tea & discarding is similar to throwing & artifact pass wanted ->  humans throwing garbage in an environment causes harm to that environment  a mind of land is a mean of percentages & a progressive is a mean of moving mind of land ->  a stream is a kind of environment  humans throwing garbage in an environment causes harm to that environment & a stream is a kind of environment -> humans throwing garbage into a stream causes harm to the stream