harvest - to collect crops , waste - to use money, time, energy etc. in the wrong way, electricity - form of energy that creates light, heat, etc., harm - to cause physical or other injury, damage, shield - large metal object held in front of you to protect you, conserve - to keep and protect something from damage, windmill - a structure with big blades that provides power, pollution - damage caused to water, air, etc. by harmful substances,

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