> The best way I know is making charcoal and burying it https://en.wikipedia.org/wiki/Biochar https://en.wikipedia.org/wiki/Biochar, for those who have not hea

> The best way I know is making charcoal and burying it https://en.wikipedia.org/wiki/Biochar https://en.wikipedia.org/wiki/Biochar, for those who have not heard of this.