Oil and gas come out of the ground packed full of energy. Manufactured oil and gas have to have energy put into them during manufacturing, so it has to come from somewhere else. So if we need a source of energy for our cars or houses, it makes more sense to use the existing, prepacked sources, ie. fossil fuels straight from the earth, than use some other source of energy to synthesize oil and gas and use that.
Sometimes it makes sense to convert energy from one kind to another, for example to transport it to where it is needed, but a lot of the time it makes more sense to use what you already have.
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