if something emits something else then that something compounds the transfers of that something else
pollutant is tangible_thing. change is when_one_thing_becomes_another_thing. moving_computer_file is transfer. volatile_memory is tangible_thing. volatile_memory is not tangible_thing. transferring is transfer. transferring is not transfer. conveyance is not transfer. change is not when_one_thing_becomes_another_thing. conveyance is transfer.