In the 20th century to "talk about the weather" was parlance for a polite non-controversial subject matter.
Now commenting on why weather occurs as it does, our effect on it, and what we can personally do about it is a deeply political act.
To mention these facts are too.
Conversation
In Pop Song 89 from their album Green, , sang;
'Should we talk about the weather?
Should we talk about the government?'
Now talking about one is almost indivisibly talking about the other.
