Heating bio-matter without the presence of oxygen creates a flammable gas which can be stored and used as a replacement for propane/natural gas. (source in comments)
/r/chemicalreactiongifs: Chemical Reaction GIFs - A subreddit showcasing the complexity of those lovely little atoms, as well as other interesting science topics in gif form. - July 14, 2018 - 22:19
/r/gifs: .gifs - funny, animated gifs for your viewing pleasure - Funny, animated GIFs: Your favorite computer file type! Officially pronounced with a hard "J" - July 14, 2018 - 19:58
/r/educationalgifs: For .gifs that provide knowledge! - Gifs are great at getting quick to digest info, and /r/educationalgifs strives to give you educational info in this quick to digest format. From chemical processes, to how plants work, to how machines work, /r/educationalgifs will explain many processes in the quick to see format of gifs. - July 14, 2018 - 19:53