上网也增加排放？发Email、看信息都在增加你的“数字碳足迹”

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The Internet’s carbon footprint is as bad as air travel. While the Internet’s carbon footprint is difficult to measure precisely, estimates place it at over two per cent of global greenhouse gas emissions—the same as the aviation industry.

Information may appear to spread around the world unseen to our eyes, but it actually passes through enormous data centres placed strategically about the globe, which store, organise and deliver everyone’s data. These data centres are extremely energy intensive—in the EU, they consume close to three per cent of its total energy usage. They also require lots of water to prevent their computers from overheating. In the US, about a fifth of data centres draw water from already stressed water sources.

A typical spam email(垃圾邮件) emits around 0.03g of CO2 emissions, though longer messages read on a laptop can go all the way up to 26g. Now multiply that by 333 billion—roughly the number of emails that get sent every day in 2022. That puts all those work emails into perspective. One study found that if every British adult sent one less “thank you” email a day, it would save 16,433 tonnes of carbon a year.

One study recently predicted that the ICT industry could account for up to a fifth of the world’s energy consumption by 2025. However, there are actions that we as individuals can take to reduce our digital carbon footprint.

For instance, to reduce your carbon footprint from emails, you need to unsubscribe from marketing and other spam emails, and only subscribe to newsletters that you still regularly read. Have regular data checks where you delete old contact lists and other documents that no longer have any use. Keep a clean inbox and delete emails that you no longer need.

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