Carbon emissions of the entire web

The average amount of carbon emissions generated from the time it took you to read the first two words of this article is twenty milligrams.

Now, depending on how quickly you read, around 80, perhaps even 100 milligrams of C02 have been released. And in the several minutes it will take you to get to the end of this story, the number of milligrams of greenhouse gas emitted could be several thousand, if not more.

This may not seem like a lot: "But in aggregate, if you consider all the people visiting a web site and then all the seconds that each of them spends on it, it turns out to be a large number," says Dr. Alexander Wissner-Gross, an Environmental Fellow at Harvard University who studies the environmental impact of computing.

Wissner-Gross estimates every second someone spends browsing a simple web site generates roughly 20 milligrams of C02. Whether downloading a song, sending an email or streaming a video, almost every single activity that takes place in the virtual environment has an impact on the real one.

In 2002, global data center emissions amounted to 76 million tons of carbon dioxide -- a figure that is likely to more than triple over the next decade, according to a 2008 study by the Climate Group and Global e-Sustainability Initiative (GeSI).

Calculating the carbon footprint of the entire web however is not as easy as measuring the greenhouse gas emissions of a car.

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Source: edition.cnn.com