sustainable energy is simply an energy source that won't run out. Our current energy sources, fossil fuels, will eventually run out. Sustainable sources like solar power, wind power, and geothermal won't get used up, they are renewable.
Even if we only supplement our use of fossil fuels with renewable energy sources we can not only make the fossil fuels last longer we will be limiting the amount of harmful pollutants released into the environment.
Our current level of technology in regards to renewable energy sources isn't as efficient as it needs to be in order to supply all our energy needs. As a country we will need to build delivery systems as well as the electricity generating equipment to harness these energy sources.
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