For the record, B5 is 5% bio-heating oil which would mean a net reduction in carbon emissions, but it isn’t right to say it produces no greenhouse gases. Given the morally ambiguous character of using food crops for fuel, I’m no longer promoting biodiesel over petrodiesel, but continue to hope for a solution from farmed algae. Until then, as with transportation fuel, I’ll stand for conservation first and cost savings for to mitigate financial harm.