老鼠记者Geronimo Stilton第二本的科学原理

老鼠记者Geronimo Stilton第二本，Geronimo的任务是采访Professor Alrat Spitfur。Professor Alrat Spitfur发明了一种新的能源。

这种新能源，其实就是发酵动物粪便（ferment animal dung）得到甲烷（methane gas）。看看产生过程的图片：

Biogas contains roughly 50-70 percent methane, 30-40 percent carbon dioxide, and trace amounts of other gases. 

Renewable natural gas (RNG), or biomethane, is biogas that has been refined to remove carbon dioxide, water vapor, and other trace gases so that it meets natural gas industry standards.

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