As a Green Building consultancy in UAE, we understand that green buildings are designed with energy-efficient designs (for example, passive homes utilize super-insulation and other measures to ensure a tight building envelope and low energy usage). Clean energy processes, such as geothermal and solar PV systems, are also commonly employed in sustainable building. Water conservation is included in the design through low-flow toilets, greywater systems, and xeriscaping. The emphasis is initially on minimizing the water demand (for example, low-flow toilets) and then dealing with water after it has been used (for example, greywater irrigation). Water collecting systems such as rainwater harvesting are also crucial in sustainable construction.