Earlier quoted context omitted.
Europeans have already noticed a "big difference" in the influx of Syrian and Afghani refugees. That invigorated anti-immigration parties, but those parties also advocated for various policies that went beyond immigration. A few million people had a huge impact on politics overall. Now imagine the turmoil and political ramifications that could spring, even in the short term, from the flooding of Bangladesh and the mi…
None of which is predicted to happen this century...
Not sure what you're point is unless to say that this problem is on a long enough time horizon (where the survival rate for everyone drops to zero ...).