There is a difference between phasing out and running out.
Fossil fuels, as abundant as they may seem, are still seen as a mostly finite resource. We have gone through a lot of it in the past 100 years. Where will the world be 100 years from now?
I liken it to 1 Olympic sized swimming pool of drinking water per person.....assigned to you at birth. That is all you get. In the beginning, it looks like a lot, so you may not be too careful with it. But at some point, when you realize you have more life left ahead of you than water to last that long, you start to conserve.
So IF fossil fuels are finite, then for society to survive, some type of alternative "make as you go" fuel has to be found. Biofuels like ethanol and bio-diesel are at least a liquid fuels you can dump into the tank that powers an internal combustion engine that will get you up and down the road, or across the field.
Or switch to electric, which is possible, but if running on batteries, are grossly inefficient.
BTW, all engines that run on biofuels are solar powered. When it comes right down to it, everything is.
BTW, as to food production, we haven't even scratched the surface. The few acres I am using to produce hobby hay for hobby horses would easily produce enough food to feed 100 people instead, and could be done largely by hand. Just no economic or other reason to do that......yet.
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