I don't know where you're getting no impact from, countries like Bangladesh are often being flooded (https://edition.cnn.com/2017/09/01/asia/bangladesh-south-asi...), in 1998 they had 68% of the country under water (https://en.wikipedia.org/wiki/Floods_in_Bangladesh). They are gradually getting more frequent and more severe, sooner or later they will be catastrophic.