Unless action is taken soon, many rural areas will become economically unsustainable.

In the early 1990s, changing global economic conditions and new trade treaties made Martinsville textiles and furniture manufacturing economically unsustainable.

But it proved economically unsustainable for the hospital, because a large proportion of patients were unable to pay for their care.

We're relying on energy sources that are politically dangerous and economically unsustainable.

Schools can no longer point to average scores while hiding an achievement gap that is morally unacceptable and economically unsustainable.

Our current energy supplies are economically unsustainable and politically dangerous.

So many U.S. dollars and jobs are flowing to China, it is becoming politically and economically unsustainable for the Bush team.

He recognized that the superpower arms race was economically unsustainable and politically self-defeating.

Even so, they are not entitled to a permanent license to operate a system that has become economically unsustainable.

Ferry ridership plummeted and the service became economically unsustainable, which led Red and White Fleet to discontinue the service.