Main Advantages/Disadvantages of Renewable Energies

Solar power:

The Sun is an inexhaustible source of energy, at human life scale. It can produce two types of energy: heat and electricity. The only problem is that this source of energy can’t be explored in places where the solar radiation is low.



Wind power:
The wind is an inexhaustible and very economic-efficient source of energy. It is harmless to the environment, although it produces noise pollution. It can only produce an efficient amount of electricity if the wind has a velocity of 6 m/s.





Hydro power:
That energy is produced by dams and it is expensive to explore. It doesn’t pollute the environment, but it makes some changes to the environment that may be harmful to the living beings that habit there.




Tidal power:
That source of energy isn’t widely used yet. The energy of the tides is used to produce electricity. It’s harmless to the environment, but it’s very expensive, and it can only be explored in some places.




Wave power:
Pelamis devices use the energy of waves to produce electricity. As the tidal power, this source of energy isn’t widely used yet, it’s very expensive and it can only be explored in some places. The world's first commercial wave farm is based in Portugal.



Now you ask me what I think about this. My answer is:
Use them all where it's possible!

Sources:
http://en.wikipedia.org/wiki/Renewable_energy
http://en.wikipedia.org/wiki/Hydroelectricity
http://en.wikipedia.org/wiki/Solar_energy
http://en.wikipedia.org/wiki/Tidal_power
http://en.wikipedia.org/wiki/Wave_power
http://en.wikipedia.org/wiki/Wind_power
RODRIGUES, Maria, DIAS, Fernando, Física na Nossa Vida, Porto Editora, 2007