Biomass is biological material derived from living or recently living organisms. In the context of biomass for energy this is often used to mean plant-derived materials, but biomass can apply equally to both animal- and plant-derived material. Biomass is considered one of the main renewable resources of the future, both on a small and large scale. It already provides 14% of global primary energy consumption. Biomass cultivation is a labour-intensive rural activity and can, therefore, create jobs in rural areas and help stem rural-urban migration. Biomass is carbon-based and can be composed of different mixtures of organic materials such as hydrogen, oxygen, nitrogen and even small amounts of other atoms, which are mainly metals. For plants, the carbon used by biomass is absorbed from the atmosphere in the form of carbon dioxide using energy collected from the sun, during the process of photosynthesis. Plants can be eaten by animals and are then converted into animal biomass. If plant material is not eaten, it is generally broken down by some microorganisms or burned, such as fossil fuels (coal, oil and gas), which come from biological material. But remember that there is a difference between the two, because biomass is not fossilized material (like oil, coal and gas) but fresh material that can grow again after being harvested. Today, biomass is used to produce electricity and heat in large-scale plants: solid biomass, biogas, biofuel or biodiesel. Biogas is a gaseous fuel, composed of methane, produced by the fermentation of organic matter. Biofuel is a fuel derived directly from living matter and biodiesel is a biofuel intended as a substitute for diesel. Biomass energy, or biopower, is the use of biomass…half the paper…wood as a heat source, or in Denmark where a plant burns twenty-eight thousand tons of straw to produce 13 megawatts of electricity. Mega Watts are a unit of power equal to one million watts. Which is a lot compared to the product of Denver's pollution. That's 13 million watts of power... which could be used in better circumstances!!! While this is a great way to generate electricity from biomass... it also pollutes many of the surrounding areas. Every year 335,000 Americans die from lung cancer, which is a direct result of air pollution. The average adult consumes 3,000 liters of polluted air every day and, as we all know, pollution is one of the biggest environmental problems today. But if we want to continue to have more electricity, etc., we should use biomass instead, because it is much healthier than any other alternative energy resource, which is still used today.!