I must say as a employee of the oil business, that hydrocarbon based fuels will still be the main source of energy also in the future.
The amount of energy stored in oil is huge. We are just not able to utilize all of it with todays technology.
Just take combustion engines. Only about 12% of the stored energy is actually transported to the propulsion of the car (wheels). The rest eveporates on the way getting those wheels turning.
Higher oil prices will force us to develop better technology and there are many oil reservoirs waiting for the oil price to reach $200 before it will be profitable to extract it. There are plenty of oil... but we need better technology to utiize more of its energy.
Oil is at the end of the day just stored solar energy.
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