Business Day: What unites Malcolm Turnbull, Tim Flannery and James Lovelock? Enthusiasm for biochar: one of the most intriguing solutions to global warming and a possible boon for investors. Biochar, the charcoal-like residue when biomass (such as agricultural or council waste) undergoes pyrolysis (combustion at 400-550 degrees, without oxygen), has the potential to pull large amounts of carbon dioxide out of the atmosphere. There is no commercial biochar production in Australia yet but …