Green Software Engineering is a new and evolving branch of software engineering for building more sustainable systems. Using these types of techniques the tech sector can play its part in tackling the climate crisis and reducing our dependence on fossil fuels. For running software electricity consumption is a key metric. Of course the source of that electricity and the carbon emissions embodied in the hardware are also important. However even if the electricity sourced consists of mainly renewable energy, consuming less electricity frees it up to be used for other purposes....