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There are a lot of renewable energies. Some of them are: the solar energy, wind energy and wave power.
After to have seen the description of renewable energies, with its positive and negative aspects, we can conclude that to obtain energy a country cannot be centered in only a type of source: it must be diversified, always using clean energies, to not cause a damage to the environment.
Although at the moment the renewable energies are much more expensive than the fossils, like the petroleum or natural gas. They don't have to be discarded, because, in the future, they will be much cheaper and efficient.
The countries must determine what alternative energy is more efficient according to its geography and necessity. Also they must have incentives to not use fossil fuels, like, for example, inverting in scientists to investigate and improve the clean energies that we have easy to use.