While most carmakers are focusing their pollution-reducing efforts on electric vehicles, a few are looking to hydrogen as a replacement for fossil fuels in future cars.

This includes BMW, which has begun testing prototypes of its i Hydrogen NEXT fuel cell SUVs in Europe, ahead of its market launch next year. The prototype BMW X5s generate electric power in their fuel cells by combining hydrogen carried by the vehicle with oxygen in the air, with water vapour as the only emission. The hydrogen is stored in two 700-bar tanks made of carbon-fibre reinforced plastic (CFRP)...

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