This thread was marked as Locked by webrosc.
There will be an Air Quality Index (AQI) meter in Minecraft that starts at 0. The AQI raises whenever:
The player uses furnaces, blast furnaces, or smokers.
Campfires, fires, cows exist in a world.
You chat, because when the people talk, they release carbon dioxide in the air.
Things that speed up the process: Cutting down trees, chopping wood
Effects of high AQI:
Mobs take damage from being outside.
The sky gets red.
Hostile mobs gets stronger, just to add more fun!
Hostile mobs start to spawn in daylight.
Acid rain: Where when it rains, mobs take damage (except it heals hostile mobs)
Villagers and Iron Golems start to attack you for wrecking their world
I believe someone has suggested this before and the general consensus was no, too much pointless stuff and added complexity that wouldn't fit into minecraft
Infact it was a sub idea on one of your other threads, so this thread can be closed