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The ever-increasing demand for connectivity and bandwidth by billions of devices worldwide has made it difficult for wireless networks and computing devices to limit the total communications energy consumption and associated carbon footprint. Green communications and computing is a field that aims to maximise the energy efficiency through system-level approaches. In this article, Hanna Bogucka, Filip Idzikowski, and Bartosz Bossy present an overview of Green communications and computing, summarizing techniques that have already shown great promise to maximize the energy efficiency in different layers of the network, and the resulting performance of such" Green architectures". They argue that these ongoing and future efforts are essential to limit and stabilise the carbon footprint of the ICT sector including wireless networks. So, are Green networks a necessity or a hopeless endeavour? Your feedback and comments are welcome.