These molecules are subsequently transformed into other biomass constituents (fats, proteins and carbohydrates) through different metabolic routes and passed around to other organisms through the food chain (Stassen et al., 1999). Biomass is currently the largest source of renewable energy in the world and a continuous expansion is expected in the following years in order to comply with existing programs aimed at reducing the consumption of fossil fuels (EIA, 2010; IEA, 2009; Eurobserver, 2010).The combustion of biomass and its derivates is regarded as low carbon activity because the CO2 emitted into the atmosphere has been recently captured by the plants through photosynthesis. Substitution of fossil fuels with locally generated biomass provides additional benefits in the form of energy security, improved trade balances, opportunities for economic and social development in rural communities and the possibility of reducing waste disposal problems (Stern, 2006; IEA Bioenergy, 2010).