alternative energy clean environment |
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| navigate by keyword : approach battery bicycle bio biofuel business calculations car clean container control cooperation coordination danger developing earth ecology electricity electrocar energy environment factory fire fuel future gain global globe green humanity illustrations man mill nature planet pollution problem production protection renewable resource risk save smoke solar stock supply system transportation wind |
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| A man with hands on hips looking at symbols of alternative energy sources on a blackboard. Back view. Concept of clean environment. |
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