Part 1: bio-energy - production, conversation, utilization; fuelwood - forestry and agroforestry; energy crops - agricultural residues organic wastes; briquetting of biomass; charcoal production; wood and charcoal stoves; biomass combustion in small-scale industry; biogas; draught animal power. Part 2: biomass energy and biomass engine fuels - production of biomass engine fuels (solid fuels/ethanol/methanol/vegetable oils) - biomass fuels in internal combustion engines (alcohol fuels/vegetable oils/producer gas); external combustion engines and use of biomass fuels (steam engines and steam turbines/stirling engines); comparison and selection of biomass engines. Part 3: solar energy - solar water heating; photovoltaics; advanced solar heating systems; solar water distillation; solar driers; solar cookers; passive heating and cooling of buldings. Part 4: hydro, wind and water power - small-scale hydropower; ocean power - tidal, wave, and OTEC; wind power; water pumping - an overview; wind pumps - hand pumps. Appendices: list of abbreviations, units and acronyms; converstion tables; list of background reports commissioned by the Beijer Institute.