[jonathannorris]

There is enough landmass in Northern Canada / Russia to do this on a mass scale. Could you coat the trees in something to greatly reduce their likelihood of burning? Therefore not having to use biochar or some other form of carbon storage.

[jasonlaramburu]

You would also have to coat them in something to prevent decomposition. Assuming that worked, over time you would take a ton of nutrients out of the system and the primary forest would eventually become grassland.

Maybe if you were growing trees specifically for this purpose on degraded land it could work.