That tractor looks suspiciously like a converted car with a wood gasifier as a fuel source. Interestingly, when I taught Introductory Physical Science back in the late '60s, which was a lab based curriculum, one of the experiments involved heating wood splints in a test tube with a glass tube delivering the products into a bottle with water. One of the chief products was methyl alcohol as vapor, but that was after condensation. It would likely have been possible to run a small internal combustion engine off the evolved gas with a proper carburetor. The other main product was charcoal in the tube, which was almost impossible for me to completely clean. Those test tubes got set aside for the same experiment the next year.

"It is not necessary to have hope in order to persevere."