The more you use redstone, furnaces, and remove wildlife and plants, it will set an increasing global pollution score. As pollution increases, plants grow slower, plants sometimes die (turn into dead bushes), trees may lose all their leaves, animals occasionally get wither effect, and, eventually, players cannot wonder around in natural air for too long without air purifiers or the breath (as used in vanilla in water) will go down. If it reaches 0, player gets weakness, slowness, and mining fatigue. Maybe grass could become browner and duller.
Now, I only know the basics of Java and I know nothing about modding. This probably will be difficult, so if you want to attempt this, cherry pick the best ideas of mine for a global warming simulator mod.
Perhaps machines from tech mods could increase pollution, but I see that being much more difficult.
Rollback Post to RevisionRollBack
I am great at command blocks, mediocre at redstone, and I am a huge fan of Minecraft. I enjoy working with command blocks. If you have an idea for a custom command block creation or you need help with commands, PM me! I create interesting posts and datapacks.