It is predicted by the scientists in of National Research Council, USA, that the situation is likely to become even worse with the climate and that the time to receive warnings and take preventive measures is likely to reduce greatly!
http://www.bloomberg.com/news/2013-12-03/sea-level-rise-too-fast-to-reverse-climate-change-study.html
Obviously! Even advance warnings would always have limitations. For example, if we allow reckless settlement of people along the coastal belts in huge numbers, it would be near to impossible to shift such multitudinous people to safer places on an advance notice of a few hours or even a day.
And more plans are on the way to reclaim more land along Mumbai coastline to make space of ever-increasing populations! :blink: Due to instability of reclaimed land, every years lots of accidents occur such as buildings sinking, roads breaking etc. and still we never learn!
The coastal regions are most vulnerable for its fragile ecological character and as you have mentioned the massive problem of Mumbai, the scenario is more or less the same of all the coastal belts in India. In West Bengal the sea beach of Digha is one such theater of environmental and ecological degradation. Countless hotels have been permitted to come up in a blatant violation of all laws in this regard despite grim warnings of scientists!!
I live in a most vulnerable coastal region and almost on the shores of Bay of Bay Bengal. Whenever there is a cyclone warning we spend sleepless nights. We faced already 3 cyclones that left a trail of destruction of immense magnitude.
As if this not enough, a new cyclone is predicted. which is named as "Madi". Now this is located 500 Km from the Chennai shores and progressing steadily towards the coast.. So, we are destined to have some more sleepless nights gripped in fear and anxiety. Please pray for us.