Good question Mr Nibbles.
Dependant on which country the inventor came from would initiate different situations.
GB - Inventor takes idea to Government for evaluation. Government decide it too costly to fully research and develop, tells inventor to go away little man. Hang on a bit, this would wipe out all the revenue we generate from fossil fuels. :mad: MI5 monitor him, just when he looks as though he's getting somewhere to completing his idea, they bump him off.
However, just before said inventor is bumped off, he pawned his ideas to the Japanese (notorious for ripping off original British thought inventions)
The Japs being Japs see a great market for this idea. They then amend the original design specification and make a prototype 1/3 the size of the original and then flood the market with it.
The world now no longer has need for the internal combustion engine.
GB. - All water used for running the new engine must now be coloured red and is to be taxed as it can only be bought from official Camelot filling stations. Anyone found using CLEAR water faces a heavy fine or imprisonment. There we go says the Chancellor, we've got us a nice little earner again Mr Prime Minister.