new possible design for tree saws?

[Climber]

I don't see the problem if some one climbing with running saw. It's called evolution or natural selection. I never did it.

I don't see a problem to start saw while on the tree. Just pull cord and its running. What is the problem???

Speaking of starting: they are many motors which are starting on compressed air. Yes you can use CO2 in bottle instead.

Talking about of most productive fuel commercially available and safe to use it's a diesel fuel. But as of today it's a fact most productive power to ratio is 2 stroke engines.
Speaking of clean fuel: H2 – hydrogen. Most clean and powerful burning fuel.

What ever you design it can't be heavier then MS200T with light bar. About 10lb.

If some one stupid enough to misuse chainsaw whey will misuse what ever you design. For example: cut its owned head with light sable.

Think of substitute climber with some kind of robot-spider, even controlled by human from ground.