Biofuels are %100 CO2 free, at least B100 grade is.
What is not free, as they have now found by actually thinking about it, is the damage caused by the felling of natural resources to aid in the production of Biofuels.
The solution is to develop technology that uses waste/used oils or esters instead of trying to grow/develop a dedicated 'crop' that will provide the performance people require.
I still think Biofuels are the way forward but we must develop the tech from the 'other side' of the equation.
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