Deltas are densely populated and heavily farmed. Because of that out of the 33 deltas chosen to be studied, 85% of those deltas suffered severe flooding. The reason for this flooding is because the over population and immense farming is removing oil, gas and water from the delta's underground sediments. The estimation for increased flooding is nearly 50%, which means more than 90% of the deltas will become severely flooded.
http://www.nature.com/ngeo/journal/v2/n10/abs/ngeo629.html
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