The document discusses the concept of green buildings and green building technology. It defines a green building as one that reduces negative environmental impacts through its design, construction, or operation, such as efficient energy and water use, renewable energy, waste reduction, and use of non-toxic and sustainable materials. Green building technology encompasses features like geothermal heating and energy-efficient appliances. The document notes that green buildings are needed in India due to the country's large and growing population and energy consumption, as well as increasing shortages of water in major cities.