Either you drive to Wal Mart and pick the stuff up, or an employee delivers them to you, potentially making multiple deliveries in the same trip. Replacing pick

Either you drive to Wal Mart and pick the stuff up, or an employee delivers them to you, potentially making multiple deliveries in the same trip. Replacing pickup with delivery is carbon neutral at worst, assuming your vehicles are equally efficient. Likely the delivery vehicle was chosen for efficiency so it's better anyway.