This reminded me of my last Civ 6 game with Gathering Storm (an expansion that introduced disasters and global warming that can be extremely destructive... 1)

This reminded me of my last Civ 6 game with Gathering Storm (an expansion that introduced disasters and global warming that can be extremely destructive... 1) Set disasters to maximum, map to old (flat), and with non-trivial amount of ocean. 2) Rush to flood barriers. 3) Build flood barriers while they are cheap (or ally the city-state that allows buying them with faith). 4) Burn coal until everybody drowns ;)