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What would happen if you could not use electricity anymore? Everything we do requires energy. Unfortunately, a great deal of the energy we generate is lost before it can be utilized. In power stations, for example, about two - thirds of the energy created is lost, mostly in the form of released heat. This is why experts have focused on " energy harvesting, " the process of recapturing and using lost energy. One method of energy harvesting involves pressure. When a material receives from another source, its molecules are disturbed. This creates a small amount of o electrical voltage. In Brazil, for example, energy - harvesting tiles were placed underneath the artificial grass of an outdoor soccer field in a poor neighborhood. The pressure created by players running up and down the field now generates enough electricity to illuminate the field for up to 10 hours, allowing local kids to play safely at night. Temperature disparity is another potential source of energy harvesting. When two 15 adjacent objects have a large and constant temperature difference, voltage is created. One company has taken advantage of this fact to create a self - sustaining telephone charger that resembles a drink coaster. The charger works when either a hot or cold drink is placed upon it. The difference in temperature between the drink and the device creates enough electricity to charge a phone. Energy that is harvested can be used as a substitute for batteries in a variety of low - power electric devices. This has several advantages, such as eliminating the need to constantly replace dead batteries. It also benefits the environment by reducing the number of batteries that end up in landfills, where harmful substances can leak into the soil. Finally, harvested energy can be used in remote regions where mass - produced electricity is not available, and even at the bottom of the sea. Currently, energy harvesting is still being developed and has yet to reach its full potential. It is likely, however, that it will play an essential role in providing some of the energy humans need in the future.
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