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Google White Screen Uses More Energy

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Google White Screen Uses More Energy

If Google had a black screen 3000 megawatt-hours per year of energy would be saved. That is the conclusion arrived at by the creators of the website Blackle, a clone of Google which uses a black background instead of white.

An all white webpage, such as Google, uses about 74 watts to display on a CRT screen (non flat/lcd), while an all black page uses only 59 watts. Google gets about 200 million queries a day. Assuming each query is displayed for 10 seconds, that means Google is running for about 550,000 hours every day on some desktop. If using a black background will save a total of 15 (74-59) watts, then that’s a global savings of 8.3 Megawatt-hours per day, or about 3000 Megawatt-hours a year. Now take into account that about 25 percent of the monitors in the world are CRTs, and at 5 pence a kilowatt-hour, that's £150,000, a goodly amount of energy and money for changing a few color codes.

Posted: Friday 3rd August 2007
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