The best thing going for LNG/CNG as a fuel – it works right now. No wonder-inventions necessary. No exotic alloys still to be developed. No superbattery still to be discovered. It works just as well as diesel, and even the price premium is gone. You can go LNG/CNG and be real clean now and if you really want to go ultra-environmentally friendly, you pay up for the bio-version of the fuel. No technical changes required. Just more cash.
Natural gas is cheap, versatile and pollutes less than crude oil, so why can the ‘bridge fuel’ not replace oil?