Diesel is a short term alternative IMO

Hydrogen isn't an energy source, it's a storage medium. We can't drill for hydrogen, and producing it from natural gas is a losing proposition due to the negative energy balance

Natural gas is a better medium term solution

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue