Taken from the January 2021 issue of Physics World. The Internet will use a fifth of all the world’s electricity by 2025 – and that’s no bad thing, says James McKenzie Fighting fit Data centres, which power the Internet, are incredibly efficient in terms of energy use. (Courtesy: iStock/Kwarkot) I recently went on a canal holiday, drifting on a hired narrowboat through the pretty Staffordshire You’ve reached the limit of what you can view on Physics World without registering If you already have an account on Physics World, then please sign in to continue reading If you do not yet have an account, please register so you can Access more than 20 years of online content Choose which e-mail newsletters you would like to receive Want to read more? Registration is free, quick and easy Note: The verification e-mail to complete your account registration should arrive immediately. However, in some cases it takes longer. Don't forget to check your spam folder. If you haven't received the e-mail in 24 hours, please contact customerservices@ioppublishing.org. E-mail Address