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"alternative energy" "environmental conservation" "power generation" "power generator" "propeller blades" "wind power" "wind turbine" "wind farm" "renewable energy" blue blade blurred clean cloud close-up "close up" cloudscape day daylight diminishing ecology efficient efficiency electricity energy environment equipment flow flowing future generator green innovation loopable looping machine modern motion nature nobody outdoors pollution perspective power propeller rotating scenics seamless shadow sky spinning sunlight technology turbine turning wind windmill "no people" renewable industry business background cg render no people time lapse low angle natural lighting seamless looping contemporary 2000s 1990s 1980s spring summer autumn dry season day exterior sunny cloudy