A nice low-tech solution is cutting peat by hand from your back forty and hauling it to your stove or air-tight fireplace. Smokey? Yes, but if you can get it to burn hot it isn't much worse than wood. (O.K., I know that wood is about the most air-polluting fuel you can burn. But it gets chilly up here near the Canadian border.)
Um! Having hauled peat for my other grandma (in Scotland) in my youth - you have to stack it and allow it to dry before you can burn it.  And when you do that then in the winter, even in an open fire, it can provide a soft glowing heat that did not burn that fast. Peat and lignite have the problem of both high water and also high ash contents that must be considered when they are used as a fuel source.
Peat burns way way better in an air-tight stove than in an open fireplace. But your are right: The labor is intensive (and not fun), and you do need to dry it. But you need to season wood too, for at least a year, before you burn it.