The development of cleaner alternative energy sources, in developed countries by the attention, such as Germany, their home country in particular to encourage the development of solar energy, hydropower, wind power, and introduced a number of preferential policies to encourage the development of a particularly fast, clean energy accounted for a high proportion of . Many use of clean energy not only with numerous, but also considerable environmental protection. Although the development of clean energy, also encountered problems, such as technology, cost, natural conditions, but I believe that as technology improved and perfected, all problems will be resolved.

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