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Coal: a fossil fuel (renewable energy) that was formed by decomposition in the absence of O2 from plant remains that were buried. Its main uses are generating electricity at power plants and heating fuel. Their impacts are air pollution (SO2, acid rain, global warming CO2) and mine tailings.

Cogeneration system for combined production of electricity and thermal energy from one fuel (usually natural gas), which greatly increases the energy efficiency (a measure of energy savings). The CHP is to generate electricity in a place of use (industry, hospitals, etc.) and use the heat normally lost to the atmosphere for various purposes (heating, hot water ...)

Fossil fuels: fuels are substances formed from the transformation in the Earth's interior, remains of organisms over millions of years and used as fuel in power stations, transport, heating, etc.. Are coal, oil and natural gas. They are a renewable resource and its greatest impact is air pollution (smog, acid rain, climate change, etc).

Biomass energy: is what is contained in organic molecules that form living organisms, and present in forest, agricultural waste, animal waste, organic matter in MSW, etc. Be exploited as fuel to generate heat or electricity, or can be transformed into biofuels such as bidiesel, or biogas.

Wind power: is the mechanical energy of wind, or used to generate movement (sailing, wind mills to grind, or pumping water) or for conversion into electricity in mills coupled with electric generators (wind turbines, wind farms .) It is a clean and renewable energy, but is irregular and Dispesa and landscape impact.

Geothermal energy: thermal energy is inside the Earth d (geothermal gradient) that is used by holes through which water is injected into the geothermal reservoir and once hot, is used for heating, or steam is generated, to produce electricity. Its main disadvantage is that geothermal reservoirs are low (areas with volcanic activity)

Hydroelectric power: the power obtained through the use of energy powers the water falling on the continents (water cycle), and often retained by dams, water drives the turbines at hydroelectric plants. It is a renewable energy that emits no pollution. Impacts arising from the flooding of large areas and changes in river flow.

Nuclear energy: the current generated in nuclear plants where nuclear fission division (nucleus of uranium or plutonium, etc.) releases a large amount of energy used to generate electricity. Their greatest impact is the possibility of leaks of radioactive materials, harmful to living organisms (mutations, cancer, etc.) and its main advantage is it emits no CO2.

Solar energy: the energy of the sun, which is used with photovoltaic systems, which directly converts light electric solenoid, or is used with solar thermal systems (with collectors to produce hot water or solar thermal power, which concentrates (mirrors, etc) to heat a liquid and generate electricity. It is a clean and renewable energy.