Infographic | What Americans actually think about energy and the climate

The new-generation UH450E is powered by a Volvo Penta TAD1651GE power-generation engine installed in a soundproof container. The electric power system greatly improves the energy efficiency of the unit.

Initiative also seeks to force the bank to keep at least 20% of its assets in the metal.

The miner's first-quarter output was higher across most commodities including copper, iron ore and diamonds.

Emeralds helped launch the career of the world's most famous jeweller.

Aside from selling assets and slashing jobs, Walsh said the company will improve performance at all operations.

American component manufacturers will have to prove they don't use conflict minerals by May next year.

It is the second-highest price ever paid for a gem sold at auction.

Copper prices dropped for the second straight day on Thursday.

The rough stone was pulled from the famous Cullinan mine in South Africa.