Some devices will power themselves but the more complex will contribute to the world’s huge data storage energy bill The internet of things (IoT) – that ever-expanding ecosystem of digital sensors, home appliances and wearable smart devices – attracts its fair share of attention. Speculation is rife on how the 23bn-odd (and counting) “things” will improve quality of life, streamline business operations and ultimately fuel economic benefits to the tune of up to $11tn per year by 2025.Less often considered is the cost to the environment of such a vast network of devices. With the full extent of the IoT far from being realised, even experts are divided on whether it will spell doom or salvation for the environment