[plain talk]

If you can’t withstand a one foot increase in sea level then you built in the wrong place and you chose POORLY. History teaches us that sea levels rise and fall over time.

[hinckley buzzard]

You nailed it. The alarm is based “on current trends” for the next 80 years. Problem is, the “current trends” are likely to reverse well before then, if the trend is even real, which remains it be seen.