Forrester Research has reported that 72 percent of companies in the S&P 500 published reports on their corporate responsibility or sustainability efforts in 2013, compared to only 20 percent in 2011.4 What is “clean” energy? In broad terms, “clean” or “green” energy comes from renewable sources such as the sun (solar), wind, the movement of water in rivers and oceans (hydroelectricity), biofuels (fuel derived from organic matter), and geothermal activity.
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