In the early twentieth century, the world has suffered from natural resources and pollution of air and soil degradation exploitation. Oil, for example, has been a source of energy, and to continue to extraction wells so they began to run low, less than 100 years after the start of their actual use. Coal is a resource oldest, is also considered esgotável. Nuclear power, as a warning of danger to the radioactive waste. The use of traditional sources of trace its history to the decrease, not only for his character, but this is a danger to the environment.
We call it an alternative source of energy in ecology is the area to be planted, renewable energy, and convened an alternative, does not affect the nature, which is why they are perennials, there are different types of sources, such as, renewable energy sources, including photovoltaic cells solar energy solar, wind turbines and the wind is the source of water and windmills are hydroelectric wheels, turbines and biomass is a plant source.
Brazil has been in international forums, aims to increase the use of renewable energy and the diversification of sources of energy to take on this task, which further reduces the risk of water shortages, which often leads to situations of crisis and rationing.
Many people believe that the production of energy from renewable sources as an isolated initiative, can not meet the needs of a large continental countries. The use of alternative energy sources are not immediately needed to abandon the traditional means. Already in Germany, for example, has shown that the use of renewable energy sources can be useful for the country, people and the environment. Equal to about a third of all German wind energy plant in the world. Half of the energy produced in Germany Europa.com entire investment distribute this representation allows the use of facilities, or biomass fuels. It is almost inexhaustible solar energy can be used to produce solar panels and solar cells. The amount of sunlight throughout the year is to enrich and encourage countries to use resources. Passive and active solar energy has two major problems.
On the basis of the active sunlight into other forms of energy methods: heat or electricity, while the passive voice is heating buildings or through strategic planning and construction used. This application is the cold more common in Europe, where the demand for heating option. Photovoltaic panels, but the most promising renewable energy source because of its main advantage is that almost no pollution. The main limitation of the photovoltaic devices is their low income levels, because another disadvantage is the cost of production of semiconductor materials is limited to those with high populations.