<P> Sustainable harvesting and use of renewable resources (i.e., maintaining a positive renewal rate) can reduce air pollution, soil contamination, habitat destruction and land degradation . Biomass energy is derived from six distinct energy sources: garbage, wood, plants, waste, landfill gases, and alcohol fuels . Historically, humans have harnessed biomass - derived energy since the advent of burning wood to make fire, and wood remains the largest biomass energy source today . </P> <P> However, low tech use of biomass, which still amounts for more than 10% of world energy needs may induce indoor air pollution in developing nations and results in between 1.5 million and 2 million deaths in 2000 . </P> <P> The biomass used for electricity generation varies by region . Forest by - products, such as wood residues, are common in the United States . Agricultural waste is common in Mauritius (sugar cane residue) and Southeast Asia (rice husks). Animal husbandry residues, such as poultry litter, are common in the UK . The biomass power generating industry in the United States, which consists of approximately 11,000 MW of summer operating capacity actively supplying power to the grid, produces about 1.4 percent of the U.S. electricity supply . </P> <P> A biofuel is a type of fuel whose energy is derived from biological carbon fixation . Biofuels include fuels derived from biomass conversion, as well as solid biomass, liquid fuels and various biogases . </P>

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