It's a patch of green, a wondrous vegetable garden that has sprung up at a height of about 50 feet on the fast-expanding concrete maze of neighboring New Town in Kolkata the eastern state of India. With a production of more than 70 kgs of organic vegetables on top of a multi-storied building that covering an area of 5,000 sq ft. A team of five farming experts who run a social service platform in Birbhum district at eastern state of West Bengal has been working tirelessly to grow more than 35 kinds of organic vegetables on the concrete terrace. What they have managed to grow is amazing. Nearly half a dozen varieties of leafy vegetables, several kinds of chillies, multiple varieties of brinjals, tomatoes, cauliflowers, cabbages, carrots, onions, beetroots, capsicum, garlic, mustard, flat beans, bitter gourd.