Jul 29th, 2008 · Americans are not driving as much because of higher gas prices. A drop in gas consumption is hurting gas tax revenues, which pay for roads, bridges and mass transit projects. Transportation officials say they need to rethink the way they collect and dispense money for transportation. They say the current system of relying on the federal gas tax is unsustainable.
Feb 14th, 2008 · The floral industry collects millions of pounds of moss from the wild. Botanists worry harvesting is occurring at unsustainable levels. In the Pacific Northwest, scientists are exploring "moss farming" as an alternative to stripping moss out of forests. But cultivation is proving curiously tricky.
Apr 22nd, 2005 · Federal Reserve Board Chairman Alan Greenspan says a combination of the current deficit and the unpredictable aspects of health care entitlement programs could put future federal budgets on an "unsustainable path."
Apr 12th, 2005 · The nation's trade deficit hit a record $61.4 billion in February, an increase driven by high oil prices and a surge in textile imports from China. One expert says this transfer of wealth to other countries is unsustainable in the long term, and recommends that consumers save more.