I would venture two objections: The first is more of a detail: you write that biomass not converted into biochar would be a "waste". But organic material, wether originating in forest or fields, is not a waste in nature, it is feed for milllions of microorganisms. It also comes with nutrients which are all but lost in the biochar process. So I would argue that large scale biochar applications is something that needs to be considered carefully. .The second objection is about the energy need. You write. "And energy-hungry CDR must add its own energy, not take it from a grid that is not yet decarbonized. " Already that is a tall order, but even when CDR is made with decarbonized energy it is a huge problem if it is energy-hungry as the future will be short in affordable energy.
I would venture two objections: The first is more of a detail: you write that biomass not converted into biochar would be a "waste". But organic material, wether originating in forest or fields, is not a waste in nature, it is feed for milllions of microorganisms. It also comes with nutrients which are all but lost in the biochar process. So I would argue that large scale biochar applications is something that needs to be considered carefully. .The second objection is about the energy need. You write. "And energy-hungry CDR must add its own energy, not take it from a grid that is not yet decarbonized. " Already that is a tall order, but even when CDR is made with decarbonized energy it is a huge problem if it is energy-hungry as the future will be short in affordable energy.
Thanks Gunnar, all "waste" biomass cannot be utilized for CDR for sure.
On the second point. Demand for energy creates more energy, especially if it does not need to be connected to the grid.