In the fourth age we created deserts. Our deserts were of several kinds, but they had one thing in common: nothing grew there. Some were made of cement, some were made of various poisons, some of baked earth. We made these deserts from the desire for more money and from despair at the lack of it.
This line shows us how the new money god has been destroying the home of humanity and how we will be left with nothing if we continue.