Basically energy is the ability to rearrange atoms.
In medieval times and before it was simple all energy was coming from the sun. Animals eat plant plant has energy from the sun, plant grows everywhere.
These animals can be used to move things like pomp water form the ground.
Humans also can be used for this
youtu.be/kIPlaor68DU
I recommend trying to push a lot of stuff or dig something without machinery.
To really feel the work in your back.
This is how life was since the dawn of time.
All labor was made by animal or humans and the ones not working where noble.
Even imagine some rich guy being carried around by his subordinates to get a picture.
This was the human condition since the start of history.
Animals and humans get their energy from food, food grows based on plants and plants get their energy from the sun.
This was a 100% solar powered life.
Water wheels and wind mills are also solar based because wind and water are moving because of the energy from the sun.
This is how it is to live in a 100% renewable energy economy.
The reason why you have phones and cars and can move anywhere is because of next level energy people discovered. Coal it allowed steam engines and modern transportation and more carbon fossil fuels where included.
They are incredibly energy dense meaning you need 100 slaves to do the work of 1 car. Yet all machines don't work without energy, specifically their hie level energy.
And here is the thing we are using up this L2 energy the more we use there less there is. And we will run out then its going back to medieval times, no electricity, no phones, no cars.
And here is the kick the population is to large to sustain itself on medieval energy we can not grow or transport this amount of food to all the peoepel who are alive today, the population explosion was because of energy.
We found a magic rock in the ground that made all of our technology possible.
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