Why should we breathe all the time ?

Why should we save paper?

Why is electrical power required at all when the elevatore is descending ? Why should there be a limit on the number of passengers in this case ?

Why should we conserve minerals ?

Why should we not view the lasers directly?

Why should we not throw (a) used tea leaves into sink? (b) cooking oil and fats down the drain?

Why should we worry about the conditions and issues related to forests far from us ?