Power consumption of JPEG, WebP, and AVIF: Across all tests, loading the WebP page had the lowest energy consumption.
(JPEG ~ WebP, AVIF was about 20% more CPU intense.)
Thames Water to datacenters: Cut water use or we will.
Although data traffic increased by more than 3-fold since 2016, network energy use dropped by 2.4% (Telefonica) and 50% (Cogent) over the same time period, demonstrating that historical network energy use is not directly proportional to data traffic. Notably, Telefonica's data traffic jumped by 45% in 2020 due in part to COVID (compared to 2019), with no reported increase in network energy use. Cogent's electricity use dropped 21% from 2019 to 2020 even as data traffic increased 38%.[koomey2021internet]
HD-quality video streaming produces different levels of greenhouse gas emissions depending on the transmission technology. The CO2 emissions generated by data processing in a data centre are relatively low, at 1.5 grams of CO2 per hour. ... The lowest CO2 emissions are produced when HD video is streamed at home over a fibre optic connection, with only two grams of CO2 per hour of video streaming for the data centre and data transmission. A copper cable (VDSL) generates four grams per hour. UMTS data transmission (3G), however, produces 90 grams of CO2 per hour. If the transmission technology used to transmit data is 5G instead, only about five grams of CO2 are emitted per hour. The electricity used by the end device is not factored into this calculation.
Update 25/11/2020: ... the central IEA estimate for one hour of streaming video in 2019 is now 36gCO2 ....
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