Propane sources
Propane (LPG) is basically a by-product of natural gas and crude oil refining.
Not exactly over-abundant as it relies on crude oil refining as well as transportation logistics to make it available. About 10% of our propane supply is imported from foreign countries.
It's environmentally safer than gasoline but prices can and are vulnerable to fluctuations, just like gasoline. Currently, propane is noticably more expensive than gasoline so I don't see it replaceing the gasoline engine any time soon, much less in ten years.
There are vast supplies of crude oil still in the earth but getting them out of the ground is hideously expensive. That's where a lot of 'gloom and doom' predictions about 'running out of oil' in X number of years comes from but that's a flawed premise. I've been hearing this 'running out of oil' prediction forever, and it's no more true now than it was twenty years ago.
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