Which weighs more all the trains that run through Grand Central Station in a year or all the trees cut down to make US currency in a year?

Both groups of items weigh nothing at all. * Grand Central in New York City is not a station but a "terminal." Trains do not run "through" it; * The "paper" used to make US paper money is not made from wood pulp but is composed of 75% cotton and 25% linen.