The question of global warming is answered: It is happening and by 2100 lots of shit will be flooded like a mofo.
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My advice
If you are under 40 look for a place 500 feet above sea level you should be fine at that level.
Lots of the world is 200 feet or more above sea level.Which would likely be fine.
You're too pessimistic.
https://earthobservatory.nasa.gov/images/148494/anticipating-future-sea-levelsThat growing knowledge base is why scientific organizations like the Intergovernmental Panel on Climate Change (IPCC) are publishing sea level rise projections with increasing levels of confidence.
In its 2019 report, the IPCC projected (chart above) 0.6 to 1.1 meters (1 to 3 feet) of global sea level rise by 2100 (or about 15 millimeters per year) if greenhouse gas emissions remain at high rates (RCP8.5).
I don't see rich people abandoning the Hamptons and Martha's Vineyard...