Rather than preach sustainable living, Prof L.K. Sreepathi of the Jawaharlal Nehru College of Engineering at Shimoga in Karnataka has designed his house to be ecologically friendly. Besides two rainwater harvesting tanks, the Sreepathis use solar energy to cook, heat water and for lighting. Though municipal water is available, the family does not have a connection and depends solely on the rainwater it collects. Named Vibha (Sanskrit for sun), the house doesn’t even have fans as it is specially designed to permit natural air flow and cooling. Little wonder, Vibha draws a large number of visitors.