It was once said cybersecurity should be built in from the ground up, at a time it rarely was. Now, the same sentiment is being expressed about sustainability. There are some similarities in that both can be ignored temporarily for short term gain in market share or profitability, but at the peril of longer-term reputational damage. Sustainability also overlaps with energy efficiency, which does save money, even if there can be contention with performance objectives. Here, it is increasingly clear that sustainability is not just about minimizing use of electricity but reducing the environmental impact of mobile networks in other ways, which includes their visual aspect, as well as disposal of hardware or structural components at the end of life.…