The results show that all the three types of catalytic converters can make the HCNG engine meet enhanced environmentally friendly vehicle (EEV) emission standard.

试验结果表明：三种催化器都能使天然气掺氢发动机排放达到环境友好型汽车标准。

youdao

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

It seems hard to imagine now, but General Motors not long ago produced the most environmentally friendly automobile in the world: the electric vehicle called EV-1.

FORBES: Magazine Article

As a particularly versatile vehicle concept, the B-Class also allows environmentally friendly motoring at the Mercedes level thanks to its innovative electric drive.

ENGADGET: Mercedes-Benz introduces B-Class Electric Drive, we go eyes-on