I don't think this is what you want to hear but in some places, warmer climate is just going to be more pleasant. Although a changing climate brings surprises and challenges of adapting to most.
This is one of the most flawed arguments that get made. I’ve been to many places in North America and Europe. Everywhere you go, direct sunlight above 65F is nearly unbearable. Air temperature is one thing, but we are super heating the entire air column between you and the outer atmosphere. Places that used to be pleasant with lots of sunshine like the SFs East Bay are now searing hot in direct sun. Yes, Maybe Quebec is more pleasant than it used to be, but it will be uncomfortable most of the summer in 5 or 10 years. Humans will certainly migrate North but Eventually we will just run out of latitude. Climate Change isn’t linear. Each year will be getting hotter faster than it did the year before. We’re toast.
Well, this is why it's boring to speculate about potential upsides because people want to bring in the downsides again. I'm not trying to argue for anything, but I think it will in fact be more pleasant to live in some places. That's not an argument that climate change is a good thing, but the question was asked, is there any upside.
