“What is happening in “the last mile” (the access networks) caused by the end user’s behavior will have a big impact on the debate of data center sustainability. Research conducted by Bell Labs and the University of Melbourne (CEET 2013) show that by 2015 wireless cloud (Wi-Fi and cellular technology) will consume between 32 TWh (low scenario) and 43 TWh (high scenario) compared to only 9.2 TWh in 2012. An increase between 248% and 367%. The take-up of wireless devices is shown by the fact that global mobile data traffic overall is currently increasing at 78% per annum and mobile cloud traffic specifically is increasing at 95% per annum. Wireless cloud traffic is about 20% of mobile traffic and approximately 35% of data center traffic. The result of this is that wireless access network technologies account for 90% of total wireless cloud energy consumption. Data centers account for only about 9%. The energy consumption of wireless user devices is negligible.”