[21]

Wouldn't this biochar be the charcoal mines of tomorrow?

What I'm saying, is that if it's cheaper than regular coal people will buy this to burn. So you still need an incentive to not burn fossil fuels.

[cschwarm]

Biochar is unlikely to be cheaper than coal, ever. Optimistic long-term estimates are $100 per ton [1].

[1] http://biomassmagazine.com/articles/4080/beyond--the--hype

[mikec3010]

There's nothing wrong with burning a renewable resource. You're still at net 0 carbon emissions.