Data centres use an estimated 200 TWh each year, more than the annual energy consumption of some countries. They contribute around 0.3 per cent to overall carbon emissions, while the information and communications technology (ICT) ecosystem as a whole accounts for more than two per cent of global emissions. Achieving sustainability means addressing environmental considerations during solution design as well as during the build. Solutions must meet pre-defined and agreed environmental sustainability criteria. The green data centres must be designed to require fewer construction materials whilst delivering industry leading PUE (power usage effectiveness) levels resulting in a smaller carbon footprint when compared to similar data centres. Improvements are also required for water efficiency and cooling technologies as well as pairing facilities with sources of renewable energy.