Supreme Court has expressed surprise over Centre's decision to reduce the radius of eco-sensitive zones from 10 kilometres to 100 metres. <br/><br/>The court said, the decision appears to be what it calls a complete arbitrary exercise of powers, capable of destroying national parks and wildlife sanctuaries. <br/><br/>The Apex court's remarks came in a case challenging the environmental clearance given to an industrial unit located within the 10-kilometre radius of Dadra and Nagar Haveli Wildlife Sanctuary.<br/><br/>The court said, Wildlife Board of India had in 2002 adopted the Wildlife Conservation Strategy which stated that land falling within a 10-km radius of the boundaries of National Parks and Wildlife Sanctuaries should be notified as Eco-Fragile Zone. <br/><br/>Earlier, the National Green Tribunal in 2013 had banned construction and halted 49 residential projects being built within a 10-kilometre radius of Okhla Bird Sanctuary situation at Gautam Buddh Nagar district on Delhi-UP border.