Again, when I started this thread, I made sure to leave out climate change, predictions, etc. I didn't want to get into the debate, mostly political, about that.
I just stuck to facts: Sea level rise has/is recorded by scientists over the last century. For the last few decades accuracy has gone up with satellite tools.
The scientific community on Earth is in agreement: Sea level is rising. I didn't mention global warming's effect on SLR due to the melting ice caps (but I got resistance on that theme anyway!), thermal expansion by warming oceans(more facts there), etc.
And I didn't even open predictions by the scientific community on Planet Earth(a hint: nobody is predicting a reversal).
I was actually surprised that I still triggered a debate: Sea level rise: True or False? No thanks, I'd sooner debate flat Earth theory.
Land goes up - land goes down, that's no problem for science measuring sea level rise.
But we can all agree on lenses. Another reason I use a wide angle (short focal) lens is it's usually faster in low light. Still with this light, I used a tripod. The fastest shutter speed the camera would do (zoomed to 20mm) was 1/3rd of a second. That never works with people. But this group actually froze on command for me: Not a blur in sight(they broke out laughing a second later).