If we want the internet to keep working in circumstances where access to energy is more limited, we can learn important lessons from alternative network technologies.
Energy storage is often ignored when scientists investigate the sustainability of PV systems.
The possibilities of pedal power largely exceed the use of the bicycle.
From the 1870s onwards, pedals and cranks were attached to tools like lathes, saws, grinders, shapers, tool sharpeners and to boring, drilling and cutting machines.
Wind power rules, but commercially available small windmills are a swindle.
A small windmill on your roof or in the garden is an attractive idea. Unfortunately, commercially available micro wind turbines deliver hardly enough energy to power a light bulb. Their financial payback time is much longer than their life expectancy and in urban areas they will not even deliver as much energy as was needed to produce them.