Pollution Patch
Each Forge and Furnace casts a radius not unlike the bee skep, but everything in withing that radius slowly accumulate pollution, the more production in an area the higher the chance of pollution. Crops grow slower, lose plenty and have a higher chance of giving curious (cabbage/potato/corn) instead of crops. Higher chance of failure when potting trees within the radius, as well as reduced bonuses from your herbs and sprouts. Fish caught in traps within the radius have a chance of giving the eater mushroom poisoning, and water within the radius acts like seawater, can't use to fill buckets, wash coins, etc. Eventually with high levels of pollution inspiration rates drop and there is a chance of randomly catching a disease from your weaken immune system unless a plague mask is worn.
*Edit* This idea was never meant to be turned into it's own thread and be taken seriously.