Experts are of the opinion that no single alternative fuel technology will dominate the vehicle industry.
At a conference in Vancouver, they said that biofuels, electricity and hydrogen fuel cells will all have a place in helping reduce vehicle carbon emissions, reports Reuters.
Andreas Truckenbrodt, chief executive of Automotive Fuel Cell Cooperation, was quoted by the news provider as saying: "This is nonsense. This is not about picking some winner. All these technologies have their value."
Lawrence Burns, vice-president of research and development at General Motors, added: "We need a full portfolio of solutions as we transition from gasoline and diesel to renewables."
Earlier this week, the Welsh researchers announced that they had carried out a study into the potential of converting ryegrass into biofuel and that their findings showed good results.
The £1 million research project was carried out by scientists at the Institute of Biological Environmental and Rural Sciences at the University of Aberystwyth.
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