H2O OR NOT CO2, THAT IS THE ANSWER(TO CLIMATE CHANGE)?

With apologies to the Bard for a rather poor parody of one his most famous quotations.
On the serious message ,we can now realistically start to look to using hydrogen rather than carbon,for zero emissions motoring.I say start because BMW has developed a series 7 Hydrogen car that drives like an ordinary petrol series 7.Indeed the Hydrogen 7 can operate with either a conventional engine or its hydrogen drive,changing from one to the other at the press of a button. We are some time away from this being a regular production car: although it clearly works okay, there are still technical hurdles (reducing the weight of the fuel tank holding liquid nitrogen for instance), avilability of supplies (one hydrogen 'pump' in UK at present ,for example! More coming on stream soon). It is still one of viable mid-term viable alternatives to the petrol engine.Its energy input sourced by water,and producing only water as an output, has got to be like finding the Holy Grailor, similar.

Tonight at 8 pm ,there is a screening of Tonight With Trevor McDonald on ITV with some coverage and insight into this extraordinary car and its development;also, a look to the future of other green fuels ,and a 'race' across London with green cars ,are expected be featured.