Middle-class Israelis from across the political spectrum are coming to the improvised tent site to protest what they consider government indifference to the unsustainable cost of living in Tel Aviv.

United filed for bankruptcy shortly after failing to get the loan guarantee the first time around, and since then, it has worked hard to reduce its unsustainable costs and improve service.

During the past decade healthcare has been receiving increased attention not only because of unsustainable costs, but also because of an emphasis on quality of care improvement.

But major airlines like United can also blame their unsustainable cost structures, and equally unrealistic pricing models, for their financial troubles.

So the real debate is about how best to control these unsustainable costs.

Nonetheless, the age of multicivilizational empires is over, and Russia will be able to maintain its rule over Chechnya only at unsustainable costs.

Ministers want public sector staff to pay more for their pensions and work longer before retiring, arguing that rising life expectancies mean public sector schemes leave taxpayers facing unsustainable costs.

That is not consistent with either the letter or the spirit of Kyoto, and it would impose unsustainable costs on the U.S. economy.

In 1988, the increasingly unsustainable costs of maintaining the border led the GDR leadership to propose replacing them with a high-technology system codenamed Grenze 2000.

As a result, the central government faces the challenge to control the unsustainable cost of providing free education for the ever rising number of students and doing so at different educational levels.