与此同时在城镇大力推广电力、天然气，农林大办沼气，改变世世代代以木材作燃料的习惯，有效地保护了森林资源。
B-Time I-Time I-Time I-Time O B-Location I-Location O O O O B-Thing I-Thing O B-Thing I-Thing I-Thing O B-Location I-Location O O B-Thing I-Thing O O O O O O O O B-Thing I-Thing O B-Thing I-Thing O O O O O O O O O O B-Physical I-Physical I-Physical I-Physical O