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Wind turbines are alternative electricity sources, the concept of sustainable resources, People in the community with wind generators turbines, Renewable energy.
People working for alternative energy farm - Wind turbine power generators process and solar panels - Focus on helmets
Engineer service check installation solar cell on the roof of factory , Sustainable energy industry concept, Renewable energy solution for climate change
Assistance technical worker in uniform is checking an operation and efficiency performance of photovoltaic solar panels. Unidentified solar power engineer touches solar panels with his hand at sunset

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