The BMW hydrogen 7 is not for sale, but is considered to be a milestone in bringing forward hydrogen as the sustainable fuel for individual transportation.

宝马氢能7系虽然暂不出售，但它是推动氢能替代燃料的里程碑。

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Through the Hydrogen 7 Pioneer Program, BMW will give industry leaders and prominent figures in entertainment, politics, business and more a BMW Hydrogen 7 for their daily use.

宝马计划将为娱乐、政界、商业要人提供氢能7系轿车。

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The BMW Hydrogen 7, for example, uses 254 kWh per 100 km, but the average fossil car in Europe uses 80 kWh per 100 km.

CNN: Commentary: Let's get real about alternative energy

Finally, Declan looked at the BMW Hydrogen 7 - its only emission is water vapour but the technology for this type of green car is still being developed and currently, there are no models on sale.

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

This week it unveiled a prototype version of its 7-Series saloon car that has a hydrogen-powered engine.

ECONOMIST: Hydrogen-powered cars