从世界范围看,农村燃料是一个早已存在而且越来越严重,也越来越受到重视的问题。 据报导:发达国家以木材为燃料约为12.3％,发展中国家约为84.2％,估计有十五亿人需要烧柴,每年大概要烧掉十二亿立方米木材,由于烧柴奇缺,有些农户不得不烧秸杆和畜粪,据统计,全世界每年要烧掉四亿吨(施一吨畜粪可增产五十公斤粮食),仅粪肥 From a global perspective, rural fuel is an issue that has existed and is getting worse and more and more and more valued. It is reported that in developed countries, wood is used as fuel at about 12.3% and in developing countries at 84.2%. An estimated 1.5 billion people need to fire wood and about 1.2 billion cubic meters of wood are burned each year. Due to a shortage of firewood, Some farmers have to burn straw and livestock manure. According to statistics, the world burns 400 million tons (applying 50 tons of livestock per ton of livestock manure) and manure