In my relatively short life, I’ve already noticed changes in the weather. Barely any snow, frigid winters, blistering summers. I remember when we were younger and I had a Slip n’ Slide (which is basically a tarp you put water on so you can slide around) and we’d anxiously wait for the temperature to go into the 80°s so we could use it, but it rarely went above the high 70°s. Now, we have summers where most days are spent in the 90°s.
Also, I remember the snow piling higher than my head. Obviously, I’ve gotten taller, but this winter you could see all the grass, and I doubt I was shorter than grass.
I’m no expert, but I’m pretty sure these things should take multiple lifetimes, no one lifetime, and definitely not the fraction of a lifetime I’ve lived.