During the depression, people couldn’t afford to buy gasoline. The US government produced a document on how to run your car using wood as fuel. This was done by burning wood in an oxygen starved container so that it produced carbon monoxide, which could be piped to the carburetor and used to run the engine. It was a homemade setup but it worked.
Later, maybe in the 1960s, someone made firewood logs by rolling newspaper into rolls. They burned slowly enough to make heat like firewood.
My ex-coworker in Kansas posted photos of her firewood and it gave me an idea. They have tone of leaves from trees and I think the leaves could be rolled up into logs by using newspaper sheets to roll up and hold the leaves in tight rolls. The leaves are dry and should burn okay, and the newspaper goes up in flames along with the leaves. If the rolls are tight they should burn slow enough to make heat and not big flames. This seems to be a good way to use a renewable resource instead of filling up the landfill.