Five Rare Earths Crucial for Clean Energy in Short Supply

Limited supplies of five rare-earth minerals pose a threat to increasing use of clean-energy technologies such as wind turbines and solar panels, a U.S. Energy Department report found.

The substances -- dysprosium, terbium, europium, neodymium and yttrium -- face potential shortages until 2015, according to the report, which reiterates concerns identified a year ago.