air pollution costs the global economy more than $5 trillion annually in welfare costs, with the most serious damage occurring in the developing world.

These catastrophic events caused more than 1.5 trillion dollars in economic losses.

trillion m3of water is used by humans per year.

trillion China holds in reserve, currency traders have a heart attack.

given that there's now over $1.3 trillion in student loans on the books, it's pretty clear that many students are far from sensible.