Major expansion + rebalance mod for DeCiv Redux. Stronger barbarians, better ruins rewards, new factions, new units, new wonders, new and revised beliefs, and so on.
What it says on the tin - due to Plastics being replaced with Synthetic Materials, other DeCiv mods that refer to Plastics are no longer compatible.
Perhaps, considering that the difference between Plastics and Synthetic Materials are but a name and quote change, it would be better to use the English translation file to change those 2 strings instead of taking out Plastics entirely. I'll make a PR soon.