In 2011 I saw the word "biochar" for the first time (or at least it was the first time I paid any attention to it). I could give you a sermon on it, but you will do better to look it up for yourself. Start with Wikipedia. There is a quick link up above. Strangely enough, your next stop may be YouTube. It will keep you fascinated for hours. I am not exaggerating when I say that this may be the most important information you have ever seen.
I have given my version on the website BioPreta SuperSoil
Note: The first comment is from a person who is well-known in the field and deserves your attention. He has included many valuable references for us.