

An aging population too. Young people commit more violence, use more substances, and get into more accidents. The Boomers still have massive influence on culture even though its not cool to market to them.
My understand that the decline of tobacco use, alcohol use, sex, and pregnancy among youth in the USA are well-established (but how many young US people are sharing naughty texts or photos when before the smartphone they would be making out?)
And isn’t the trans and nonbinary stuff a norm that teh yoofs are enthusiastically breaking while people over 50 fret?
The tabletop game Attack Vector: Tactical from 2004 also models the need for radiators and risk of overheating.
Science fiction from the 20th century tended to ignore cooling and cosmic rays (the one exception I can recall is Jerry Pournelle’s superscience Langston Field) and we know these guys are not up to date even on pop culture or good at reading.