The uneven heating of the earth by the sun results in the poles receiving less solar energy than that received on the equator. In addition, land is able to both heat up and cool down more quickly than the oceans do. This differential heating results in the jet stream in the upper atmosphere and the characteristic winds on earth: midlatitude westerlies, polar easterlies, and the trade winds. Wind energy is most commonly harvested via a windmill for generating mechanical energy or a wind turbine for generating electrical energy.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.