Phil Schaub

To kill ants without any damage to the environment, I would try getting a tank of carbon dioxide (CO2). Attach a length of pipe so that the CO2 comes out the end. With the CO2 flowing, press the pipe against an opening from the nest. The flowing CO2 will blow soil aside, effectively drilling a hole into the ground. The CO2 will kill with two effects: 1st, lack of oxygen displaced by the CO2, 2nd, cold will freeze the ants or at least slow them down. I have not had an opportunity to try this, but it makes sense to me. Good Luck!

A suggestion of an accessory for your walking sticks. Instantly turn the stick into a shield to ward off dogs, snakes, etc.

Have flat, hinged metal segments that can be quickly pushed from lying along the stick to extending out from the stick. With three or four sets of such metal segments spaced around the walking stick, when those  all project extend a foot out from the walking stick, spin the stick and you have what appears as a solid shield to an animal.

This can be accomplished by having two foot long metal pieces that normally lie along the stick. Hinge them together and then when pushed together project out from the stick. Secure them to the bottom of the stick (also prevents wear and tear). Connect a move able bit of pipe at the top as a handle. Push the handle toward the bottom and you will force the flat metal segments to extend.

Sorry if this quick write up is not clear. I am new to Permies, but happy to follow up with more details if you wish. I will try to check in in a few days if I can figure out how to get back to this thread.
Phil