Solo Stove is a US Company making wood burning / biomass stoves that are ultra efficient and eco friendly. Fuel is free and readily available in most environments, so there's no need to carry gas cartridges or bottles of petrol when out backpacking. Just pick up some twigs and get cooking.
The clever design of the Solo Stove means that rising hot air, and the absence of oxygen created by the combustion process, pulls air through the bottom vent holes. This air movement fuels the fire at its base while also providing a boost of preheated air through the vent holes at the top of the burn chamber.