What would you expect your tv to be if you inhaled a foreign object which completely obstructed your right mainstem bronchus?

The tidal volume (TV) will be decreased greatly and it will be reduced to more than half of normal. In the event of complete obstruction of the right main bronchus; the whole right lung becomes a dead space wherein the right lung will not be ventilated. Ventilation is the exchange of gases between the atmosphere and the alveolus (which is primary site of gas exchange). 

The moths will eventually become extinct

They use the si unit, or metric system its all the same thing