“ Agenda 21 is a comprehensive plan of action to be taken globally, nationally and locally by organizations of the United Nations System, Governments, and Major Groups in every area in which human impacts on the environment.”
Adopted by 178 governments at the Conference of Rio 1992
Biomass can be converted in energy in the form of heat or electricity, or in the form of fuels such as biofuel or combustible biogas.
The conversion process is based in the photosyntesis that happens within biomasses for their organic constitution. Carbon dioxide and water are converted into gloucose and oxygen gas through the imput of energy.
Many types of conversion: thermal, chemical, biochemical.
Biomass as an alternative Where does it come from?
Aquatic and terrestian vegetation, residues from foresty or agriculture, animal waste and municipal waste.
Crops, wood, manure, land fill gases and alcohol fuels.
Ethanol is one of the biggest examples of biomass fuel.
The most sustainable ones are: crops that don’t compete with food crops, crops residues such as wheat straw and corn stover, sustainably-harvested wood and forest resudues and clean municipal and industrial wastes.
Biomass as an alternative What about CO 2 emissions?
The converting process of biomass, at least the most common ones, produces air pollution.
The carbon from biomass is realeased in the atmosphere in the form of CO2
Burning fossil fuel releases carbon dioxide that was captured during photosynthesis literally millions of years ago. As it is burned, carbon dioxide is released as a new greenhouse gas, a ‘new’ carbon dioxide. Biomass fuel, on the other hand, releases carbon dioxide that was recently captured during photosynthesis and it tends to equal itself out .