Whenteh game started back in 89, and when it was being written before then, climate change wasn't really a Thing, but pollution as. The days of rivers being on fire and casual littering weren't that far behind us and those who grew up in that time still recall the messaging.
So, when Cyberpunk was invented, and Shadowruncane about, things like Acid rain were the "new hotness" and got featured. if you started it TODAY, you'd probably see high levels of water, coastlines changed, and so on, but in 89, not so much.
That said, the Great Ghost Dance (GGD) mucked up the weather something awful and in some areas it's just freaky. Rain that erupts from the ground, blood rain, hundred degree hail, and so on. The closer you get to old Ute territory the worse it gets.