What Villanelle said. Are we supposed to just abandon the entire western half of the US? Should be easy!
I don't think anyone said it would be easy, it's a lot of environmental refugees to manage.
The original comment was to "avoid living in dangerous forested areas". That's essentially impossible, and also just send people to areas prone to other disasters, so it's rearranging deck chairs on the Titanic. It would accomplish nothing as far as making people safer, preventing damage to homes, or otherwise mitigating climate-related refugees. We'd just be evacuating them from river flood plains or digging them out from tornado damage or hurricane havoc instead of dealing with their homes (and lives) being lost in fires. That's not a meaningful solution to anything.
So what is "a meaningful solution"?
There have always been situations where the decision is "move or die". That decision is already upon a significant number of people in the equatorial belt and some of them are already dying because it is being made too hard for them to move.
Those hard decisions are now coming to the northern hemisphere.
The point is that (especially if we are limiting this to the confines of North America), "move or die" is meaningless. Move or die from a fire, maybe. But that could end up being "die in a fire or die in a hurricane" or "die in a fire or die in a tornado" or "die in a fire or die from heat exposure". There's no place that's safe, which is my entire point. There are places that are relatively safe from large-scale fires, but I'm not sure what that accomplishes when you might just be trading the fire for the frying pan, with the frying pan being some other natural (ish) disaster, amped to 11 thanks to human-driven climate change.
While no place would be totally safe, I've read that the "Best case" for 2050 in North America is north 42 latitude, with the 45th parallel being the sweet spot, and 105-80W - so basically the Great Lakes to the Dakotas and northward, with the major risks being heat and floods, but not nearly as bad as for the rest of the country.
As someone who grew up in tornado alley, tornadoes are about the easiest natural disaster to prepare for (in terms of saving lives).
I currently live just south of the 42 on Lake Erie (or 10 miles from the Lake), and our weather is really remaining quite temperate compared to other places I've lived. Our rain patterns have gotten a bit funky, but we installed a back up sump pump last year and upgraded our basement waterproofing.
Our town is upgrading their sewer systems currently and starting to talk about burying power lines.
In the grand scheme of not safe, it seems like tornados and floods from rain are definitely easier to mitigate through infrastructure than fires, hurricanes, and tidal floods?