Bengaluru is nostalgia capital - anyone who has lived here for more than a few years can talk about how things have gone downhill. The change is not just anecdotal. A study by researchers at the Indian Institute of Science in the city looked at what the city will be like in four years time, in 2020, if the present rate of growth and degradation continues. And the statistics are frightening with only 5 per cent of the city likely to be free of concrete and construction. This will have a major impact on groundwater, tree cover and even the famous weather.