As for the emissions involved in the life-cycle of biofuel production, that varies according to the input utilized, Chris, as does its impact on food security. Not all biofuel inputs require nitrogen fertilizer, and not all replace food crops. I'm perfectly willing to discuss biofuels and what does and does not make sense (environmental, economic, food security, soil and water use, etc.) among them for the DR, but probably best done in another thread. Let's not get side-tracked into a long talk on biofuels here.
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