Those Chines ghost citys are "Invested Interest",

right,

they didn't just shove that interest up their ass, they covered it.

So if the world econemy collapes ( hellloooo ) and some one comes to collect the interest, it's covered with something fisical.

As fare as the oil goes, they may deam it as to desructive and turn it off or just expand on it and make it more efishent.