The sentence that uses a gerund phrase as a predicate noun is: My job is leading people to their seats in the auditorium. The gerund phrase used in this sentence is "leading people to their seats" and this is used as a predicate noun.
Is there a question to this? lol
Me and my family help to reduce pollution by riding our bikes instead of taking our car. We also help preserve natural resources by taking shorter showers and not wasting water. (This is a simple answer and you can add on to it)