By Richard Westcott
BBC Breakfast correspondent
Riding the world's first purpose-built hydrogen-powered motorbike may be environmentally friendly - and fun - but where does it leave its more traditional petrol-driven cousin?
Weird. Weird and fun. That's what it's like to ride the world's first purpose-built hydrogen fuel cell motorbike.
The only noise is from the tyres and the wind whistling through your crash helmet. People don't look around as you approach - they just stare after you've gone past.
The ENV (Emissions Neutral Vehicle, envy for short) accelerates like a 125cc scooter. It's smooth and easy to control, will do 50mph and has a range of 100 miles.
All that, and the only garbage you're belching into the atmosphere is water vapour.
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http://news.bbc.co.uk/2/hi/science/nature/6333729.stmVery hefty price tag, but it's a first-off, so we knew that.