I think we've gotten to the point where the question can be asked looking back, not forward: think back to your childhood and how much things have changed since then? If you've lived long enough you can notice these things.

I used to have snow for weeks each winter in my city and now if I get 2-3 days of snow a year it's unusual. Extreme weather events where it rains in one day as much as in one month have become a recurring event to the point we're re-planning sewage systems around these things.