"But the situation is unsustainable and clearly needs to be resolved."

Some of these numbers are clearly unsustainable.

The system is clearly unsustainable.

While in water supply systems cost recovery levels are satisfactory, the situation regarding sanitation is clearly unsustainable.

Sometimes more energy is put into growing the crop than is obtained from it, which is clearly unsustainable.

The present social care system is clearly unsustainable and in need of significant revision.

The performance was labeled "clearly unsustainable" by its chief executive, Gerald A. Grinstein, who took charge of the airline this year.

In both cases, this led to extraordinary balance of trade deficits, which were clearly unsustainable for advanced economies.

Some mines, for example were clearly unsustainable without government subsidies.

In a joint statement, they said: "The Medicare program is clearly unsustainable in its present form.