Green buildings are designed to reduce their impact on human health and the environment by using resources efficiently, reducing waste and pollution, and limiting environmental degradation. The Indian Green Building Council promotes green building practices in India and has developed rating systems to certify buildings as Certified, Silver, Gold or Platinum depending on their sustainability performance. Some top examples of green buildings in India include Suzlon Energy's Platinum-rated headquarters in Pune, the Silver-rated Rajiv Gandhi International Airport in Hyderabad, and Nokia's Gold-rated office building in Gurgaon.