You'd have to go back to the 19th century for those non-fossil carbon dioxide variations to matter.
https://www.newscientist.com/article/dn11645-climate-myths-we-are-simply-recovering-from-the-little-ice-age/
The notion of nice summers is way older than that, probably.
General rules:
Exceptions may be made at the discretion of the mods.
You'd have to go back to the 19th century for those non-fossil carbon dioxide variations to matter.
https://www.newscientist.com/article/dn11645-climate-myths-we-are-simply-recovering-from-the-little-ice-age/
The notion of nice summers is way older than that, probably.