I just wanted to give my opinion on the Bow saw, mine is made by the Famous Stanley Company, but you will find them everywhere, made by good manufacturers, and of course bad.
A bow saw is required to cut green timber, like a tree for instance. These saws are made to stand loads of abuse, cut damp wood, and are light, so easy to take up ladders. The saws are very good at cutting green wood.
A bow saw has blades which are very simple to change, & they also come in several different forms, from very coarse ones to fairly smooth. You can even make a tidy cut with one of these, especially in a material such as plywood.
The size of my saw, is 762 mm, this is a good general purpose size for most jobs. The blades are held in place by a spring clip, which is quickly released to insert another blade. The frame is steel, and as long as it is protected against rust, will last a lifetime, I bought mine to get rid of a few branches, so it has paid for itself already.
The saws are very easy to use, but you need to be careful when using them, especially when starting cuts as the long teeth tend to jump a bit at first.
These saws are easy to stow away because they are flat so can be either kept in a toolbox, ot hung from the garage wall. It is also easy to hang over your shoulder to carry. They are very good for lopping off tree branches, or cutting firewood.
You can buy these at every DIY Store, and they are cheap enough nowadays. You can get a decent one for less than five pounds.
As with any tool with sharp edges, take care, or you could end up with a nasty cut. Also be careful if you actually have to climb the tree.