LuciaStoves are dual-use biomass gasification stoves that have 96% combustion efficiency. 10 litres of wood pellets produce only 50 milliliters of ash... truly. When running in char mode the stoves produce biochar which is the only feasible method of carbon sequestration currently available. Biochar from millions of households using these simple stoves could reduce emissions through avoiding emissions from inefficient stoves and burying biochar in soil as a soil amendment by 40 million tons a year. Or about the amount of emissions from a small first world country such as Ireland.
My buddy Iuval and I are building stoves like these for home use in Atlanta and the Southeast with ArkFab Labs.
Gasifiers like this can also be used to run steam powered gensets such as this one from Joe Carruth.
Things get interesting at 4:00, take a look, this video has 100k views for a good reason. These technologies have the power to free people from their dependency on fossil fuels and centralized energy conglomerates.