[oldpond]

What about grinding it up into soil? They have developed techniques in British Columbia to grow fully mature forests in 10 years by laying down a mixture of soil and nutrients 6 feet deep and then planting seedlings very close together. The close competition causes the seedlings to grow faster.

Grind it up, soak it with nutrients and plant forests on it.

[therealdrag0]

Grinding things up would be pretty energy expensive, which kinda defeats the purpose. Also That's kinda what landfills are: dig hole, fill it up until it's a mound, cover with dirt and grass.