Is there a dirt shortage facing the globe or something? If we run low, we'll bring more in. Now, why don't you help us by starting a dirt collection in your hometown? I'm sure there's plenty of dirt there. Here's a hint. Look under the snow.
Oh, that's brilliant. Put down five feet of dirt. Build homes on it.
Oops, it sinks five feet over the next two decades. What are ya gonna do, spread five more feet over the existing roads and yards and then jack up the homes to put dirt under them?