This document provides an overview of biomass energy sources. It discusses that biomass is the oldest renewable energy source, as humans have used biomass through fire for centuries. The document then outlines various biomass energy topics like the global energy potential of biomass, European energy scenarios, future biomass technologies, and conclusions. Specific biomass energy sources are examined like animal residues, industrial residues, forestry and agricultural crops/residues, sewage, and municipal solid waste. Projections are also provided for biomass energy production in the European Union, India, and worldwide.