Brain teaser for March 12 by Josh Wruck

Which weighs more? (info at end)

1) All the trees cut down to make 2,000,000,000 $20 banknotes, or:
2) All the trains that pass though an end of the line train station per year

Each banknote weighs 20g, excluding ink. hidden messages, ya!

Each train carries 20 tons of goods.

On average, the station has 20 trains per day, 364 days per year (no new years day)

Exclude all variables, assume there are none (weight of trees lost by processing, trains that are loaded wrong, etc. Just do the math)

So, which weighs more? Listen in class for highlights.

Like I'd put the answer here for those who can read between the lines and saw the highlight hint.