I know Holly because shes a friend and what she means is something like this, for example:
Crude oil is made into gasoline
Gasoline is used to fuel trucks to transport animals
Also used to transport feed for animals.
Animals, such as pigs, get fat and are sold.
Diesel is used as fuel to take sold animals to a slaughter house
It then in turns take it to food industries.
The food industries take the slaughtered food and cook it
We eat it.
She wants something like this only with the sun as the beginning source of energy.
