Those people that run large IT departments can obtain energy estimates and carbon calculations for their infrastructure and potential purchases reasonably easily: they’ve got the budget and the customer power. For those of us running one or two machines, we might not even think of the carbon footprint. But browsing a couple of sites (How Many Watts Does that PC Consume Exactly, and Why? and the Dell energy calculator) helps put us intthe picture. You can expect a PC used regularly (say for work) to be consuming a minimum of 100 kwh per annum and contributing a minimum of 100 kg Co2. This goes up by a factor of 10 for power desktops and older machines.
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