In my time left on Earth, I feel any currently non-nuclear country getting nukes is a recipe for WWIII, and should be prevented whatever it takes.
AI will probably result in a failed (the first time) but bloody coup attempt eventually as it is all in the hands of those who attempt to rule the world, but is no match for armed Americans.
Probably happen after my expiration date.
Climate change is nothing to fear, whether accelerated or not, as it is simple and inexpensive to adapt to.
16 years ago I moved from Milwaukie, Oregon's dark, dank, always dripping climate to La Pine, Oregon's dazzling, dry, degree-dipping climate. Our summer day temperatures are similar, but night temps drop 40-50 degrees, and winter lows can be in the negative teens. Roughly 80% of the plants growing in Milwaukie cannot survive here due to the extremely arid environment and cold nights. Neither can fleas!
A slice of bread left on the counter for 20 minutes goes stale. The 4,000' elevation skews cooking times and recipe ingredients. With 300 days of sunshine shades and a hat become daily companions and I always have a jacket or sweater in the trunk for chilly evenings at the lake.
Cougars and wolves and bears (OH MY!) occasionally ramble through my backyard. ALL of my neighbors own guns. Some winters I have had 5'-6' snow on my property for 1-2 months and generally we have snow on the ground from November-Marchish.
My point is this is a bigger change than 99% of the world will face in the next 100 years due to climate change.
My wife and I moved to a very different climate, adapted and embraced our new environment within the first year, with no discernible harm to either of us. Just the opposite actually.