Back in 2008 when we went out west an competed in Jim Masons escape from Berkeley event we were not allowed to use any fossil fuels. In order to salvage wood along the road side we used an electric chain saw with enough electric cable to reach a good distance from the generator . The generator was powered with woodgas from the truck gasifier.
We would look for dead or dry tree branches along the road side , cut them and carry back to the truck where we had an electric table saw to cut them into the correct size for the gasifier.
I would like to see the gasified chain saw work all day ,
If push come to shove one can chain a pissed off beaver to a tree and create a lot of wood chips