The heroic efforts of early industrialists adding carbon to the atmosphere avoided this calamity and set us up with a level of comfy and productive climate unknown in the quaternary.
Amazing how humanity keeps lucking out like this.
Today's bloated world population, completely reliant on mass agriculture only made possible by stable climate patterns, isn't so lucky. A fact your cheeky, inch deep provocative comment entirely ignores.
That's because RuBisCO is a terrible enzyme that only barely works; photosynthesis works better the more CO2 you feed it. RuBisCO actually evolved in a higher-CO2 atmosphere and is optimized for that one, not ours. Terrestrial plants today are basically an alien species trying to adapt to a marginally (from their POV) frontier planet.
Now, you could argue that this climate model or that climate model increase net productivity once you take into account land use patterns, population shifts, blah blah blah. You can make these models say whatever you want them to say. Truth is, biomechanically, more CO2 means higher yields with same inputs on the same land, and we are very good at making land suitable for agriculture.
Stronger extremes will hurt crops too.