In Tokyo, all waste disposal is handled by incinerator factories and in Denmark the fuel for the incinerator comes from the recycled gas given off by the machine itself. Some of the gas is even used to heat nearby homes in winter.
在丹麥，焚化爐所使用的燃料，就是它本身焚燒產生的氣體回收再利用；冬季，焚化爐廠還透過暖氣管提供鄰近居民暖氣。