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今天的人类为什么要感谢几亿年前的森林？
source link: https://tech.sina.com.cn/d/c/2018-11-30/doc-ihmutuec4926001.shtml
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来源：科学大院几亿年前的地球上，森林出现了。在几亿年之后的人类，用电、取暖、工业发展……我们依旧要感谢远古森林。远古森林不仅完善了地球生态系统，还造就了与我们生活息息相关的煤矿资源。那么，森林是从什么时候开始形成？煤与远古森林又有什么关系呢
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