On: Alaska’s thawing soils are now pouring carbon dioxide into the air

[lutorm]

The key is phrase is "... such that its carbon content does not quickly return to the atmosphere". Growing grasses for biofuel wouldn't help.

[bluGill → lutorm]

Growing grass for biofuel can help: if you burn just the hydrogen and not the carbon you can then sequester that carbon. It is called making charcoal.

Pulling the above off in an energy positive way is left as an exercise to the reader. (read I am not sure you can, but I wish you would)

[carapace → lutorm]

Bamboo can be used to make biochar and then buried, sequesters carbon and enriches the soil: https://en.wikipedia.org/wiki/Biochar