[0] sounds like you're saying "my gut says its improbable that we can detect sea level rise 50 years ahead". Why does it seem that way? These scientists are using evidence for these estimates so they are not pulled out of the air.
[1] Are you going to remain skeptical without looking into it, seems more like you're dismissive rather than skeptical but maybe I am reading this wrong.? How could any researcher ever make the claim that something is a big issue and needs to be investigated further and fixed without triggering this skeptical reflex?