Traditional pottery doesn't have to change. It's how much we use, not technique or technology that does the harm. If energy input is spread over years of use, the energy to produce and transport pottery will probably look pretty small compared to travel, home heating/cooling, and food energy costs. (Of course, wood firing is carbon-neutral as long as the wood is continuously regrowing.)

If, however, our demand for new souvenir mugs and building tiles grows without bounds, we will deforest or deplete or raise the price of food this way too. We need to recognise our energy budget and live within it.

Line an obsolete satellite dish with shiny potato chip bags and turn it to the sun for a few hours, and you could probably fire one item at a time with solar heat alone. It's less convenient than fossil fuel and in case of clouds, even less controlled than traditional burns, but you can't beat the price.