[nostromo]

> those trees will eventually die and that carbon will cycle back through the biosphere.

Trees in forests are self-replicating. When one dies another grows in its place.

Yes, this isn't the only solution, but it's certainly part of the solution.

[lend000]

Yes, but the point is that there is an upper limit to the contribution, and even reforesting unrealistically vast tracts of land does not make up for carbon extracted from deeper in the crust. Growing, cutting, and burying fast growing trees deep in the Earth, then replanting them, would not have that limit (although there would be other problems keeping the land fertile).

[nostromo]

If you wanted to keep sequestering after the forest matures, just bulldoze the forest ever few years and put the logs in a cave.

You've accomplished everything other sequestration technology promises, but you've done so in a way that is environmentally friendly.

[otterley]

Better than that! Trees reproduce at a ratio much higher than 1:1.