Nevertheless, many environmentalists fiercely resist any moves to ease arbitrary, prohibitive barriers to the construction of the best non-carbon-dioxide-producing energy source of all: nuclear power plants.

FORBES: Fact and Comment

Honestly, this is no big deal with lightweight in-ears, but many audiophiles prefer cans with open-backs or higher impedances, which respond best to an abundance of energy from the source device.

ENGADGET: Smartphones for audiophiles: is the iPhone 5 more musical than its rivals?