Also a type of electric vehicle, a fuel-cell car takes hydrogen gas and converts it into electricity, while emitting only water vapor.

CNN: Hydrogen fuel-cell cars look to overtake electric autos

All were electric vehicles of one type or another, part of a bewildering fleet of concept cars and racers that Venturi has brought out since 1984.

FORBES: Written by Jim Motavalli

The energy released in fusion is carried mostly by neutrons, a type of subatomic particle that has no electric charge and hence cannot be confined by the magnetic bottle.

ECONOMIST: Fusion power: Nuclear ambitions | The

American officials accuse North Korea of breaking a 1994 agreement, in which North Korea agreed to halt its production of plutonium in return for America, Japan, South Korea and other countries providing the impoverished country with fuel oil and, later, nuclear reactors to produce electric power but of a type that would make it harder for North Korea to extract plutonium for weapons.

ECONOMIST: Old allies turn on North Korea

And Renault, which is making the biggest push into electric vehicles, is planning to launch a scooter-type car called the Twizy (in which a single passenger sits behind the driver like on a motorcycle), a midsized family car called the Fluence and the sportier Zoe.

ECONOMIST: Rational consumer

The wave of Vine adverts from everyone from General Electric to Gap will mostly have been produced by digital marketing type agencies rather than in house, MacMillan says.

BBC: Magazine

The fourth example was a G-Wizz electric vehicle which is the most environmentally friendly or carbon neutral green vehicle type.

BBC: NEWS | Programmes | Breakfast | Low carbon family: "Green" cars