Modern incinerators are in much higher temperture. When well managed -- by keeping the temperature right-- most of chemicals are broken down before emittion. L

Modern incinerators are in much higher temperture. When well managed -- by keeping the temperature right-- most of chemicals are broken down before emittion. Landfill contaminate ground water. There are no good way to fix. Water-proof layers have problem with rain. Building a sewage system open another can of worms. Sealing... I have no idea how can you seal this amount of land.