This document discusses green buildings and their importance. It begins by outlining how buildings impact the environment through their energy usage, materials consumption, and waste generation. It then defines green buildings as structures that more efficiently use resources like energy, water, materials and land compared to standard buildings. Some key points made include: the Indian Green Building Council promotes green building standards and certification in India; the Hyderabad Metro Rail Project employs various green features like regenerative energy systems, rainwater harvesting, and LED lighting; and the advantages of green buildings are lower costs, reduced environmental impact, and expanded markets for green products and services.