looks like the poster is having difficulty in marrying the actuality of global warming with their misinformed opinion of how it ought to be.
so sorry Li, regret to inform that your noting of a maximum temperature decades ago doesn't preclude that temp from happening again.
whatever misinformation led you down that garden path would be worth deleting.
Li, can i suggest you avoid confusing the climate of the lower 48 with that of the world. The climate of the lower 48 isn't a proxy for anywhere.
at the risk of oversimplifying things, though it needs to be done here, that would like equating apples and oranges. Like, just silly.
i continue to advise that in order to get a handle on global warming and the climate change it brings that you look at what's actually happening.
what you want to happen has no relevance whatsoever. Only the most up themselves would ever imagine their opinion could possibly impact global temps. Only the most up themselves.
below, published in recent days.
it is reproduced here from NOAA's monthly global climate report for May to show how warming isn't uniform across the globe. Readers will notice some areas had temp anomalies well above the 1990-2020 base period while some other areas posted anomalies below the base period.
Some of these differences can surely be sheeted home to how regional weather played out during the month.
keen observers will note temp anomalies approaching the Arctic were among the highest on Earth.