I say low-tech because as long as people have been lighting fires they’ve been using biomass energy. But please don’t confuse biomass energy with the term biomass, which means the total weight of all organisms in a given area.
Biomass or biomass energy, for our purposes, means organic matter used as fuel. Organic matter equals plants, animals, waste products, or anything that is carbon based and can burn. In the UK they acquire biomass from... Read Full Article at Celsias