How green is google search engine?

A typical google search returns results in less than 0.2 seconds. Queries vary in degree of difficulty, but for the average query it takes just a few thousandths of a second. Together with other work performed before your search even starts (such as building the search index) this amounts to 0.0003 kWh of energy per search, or 1 kJ. Google does more than 200 million search queries per day Google runs on Linux OS and they have more than 10000+ servers

What goes into google search engine

A Harvard University researcher estimated that a Google search generates something like 7 grams of CO2. Google engineers rebut this with an estimate of 0.2 grams.

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