It’s renewable in the same way that whale oil is renewable

For ultimate effect, let’s figure out how to turn the ground under solar panels into peatlands.

The main problem with mowers is that they can’t get around equipment very well, so there ends up being labor intensive trimming that needs to be done

Based on plenty of reading I did lately, the Sofirn LT1 might fit the bill for you. I was just looking for a lantern, but my use case was more as a small light I could take backpacking, so I went for a flashlight with a diffuser.

The LT1 is aluminum, waterproof, has replaceable batteries, can run on 1-4 batteries, runs on open source firmware, and it can be used as a power bank. It runs on 18650 lithium batteries, which are widely available. I’m no battery chemist, but lots of 18650 powered devices can run on cr123 batteries (which arent rechargeable), and those supposedly can hold a charge longer than the rechargeable batteries.

If you want to avoid electronics altogether, the Coleman powerhouse might be the move. Obviously, you need to be careful with anything flammable indoors, and it generates a lot of heat, but it should last a lifetime (minus the mantles which are a wear item). A lantern that uses mantles is going to be an order of magnitude brighter than a lantern that uses a wick (which is still a wear item). Propane lanterns are similar if you prefer that to liquid gas.

Or sometimes, they will reinvent trains and boats, but worse.