The solar and wind stuff keeps getting better. We&#x27;re already at an inflection point where the renewables are cheaper than the fossil fuels, in some areas. Oil is going to have continue to get cheaper if it wants to stay ahead. The longer Saudi keep their oil, the worse this gets. It&#x27;s a vicious circle for them - they want to sell it all now, because the selling it in the future will be harder. This cycle ends in it being too expensive to get the oil out of the ground.<p>The Chinese don&#x27;t like the fact that coal mining kills 1000s of their citizens each year, nor do they like the smog. They know growth in their economy has to come from an alternative fuel.<p>Making a better engine might slightly perturb the virtuous path we&#x27;re on. If it does, it will slightly delay the trend away from fossil fuels. But mainly it is irrelevant.